The CONVERT call is to force the second date to be parsed using date format 103 (i. Syntax DATE_TRUNC ( 'datepart', timestamp) Arguments datepart The date part to which to truncate the timestamp value. ADVERTISEMENT. The following queries show an example of how to calculate the completion_days as the difference between eco_date and orginated_date. I know that I can do another query to then get the max ID but I would ideally like to just go by timestamp. A string that represents a timestamp value in the format specified by format. If a maintenance event is scheduled for a given week, it starts during the assigned 30-minute maintenance window. The DATE, TIME, TIMETZ, or TIMESTAMP. The 15 date functions with examples are the most commonly used ones by Redshift developers. Redshift Spectrum ignores hidden files and files. Example. The same query was executed in both the environments. md at master · awsdocs/amazon-redshift. 0 engine is available. 1 Answer. The following query uses the ADD_MONTHS function inside a TRUNC function. select to_date ( '20010631', 'YYYYMMDD', FALSE ); The result is July 1, 2001, because there are only 30 days. The first date in the comparison. Instead: select (case when 1=1 then datediff (month, '2009-01-01', '2009-12-31') else datediff (month, '2009-01-01', '2009-12-31') end) as nummonths; I assume this is oversimplified code, because obviously the case is not needed in any. This can be up to 128 TB per node, reaching potentially petabytes of data in a cluster. However, since the requirement is to generate monthly reports which I would assume to be a. For example, to find the difference between two dates in weeks, use the below statement. Amazon Redshift Advisor offers recommendations about how to optimize your Amazon Redshift cluster to increase performance and save on operating costs. All in One Excel VBA Bundle. Each value that Amazon Redshift stores or retrieves has a data type with a fixed set of associated properties. Then you have to terminate that specific session to solve locking problems. In MSSQL server I use the following WHERE CLAUSE: Last quarter: WHERE DateTime>= DATEADD(qq,DATEDIFF(qq,0,GETDATE())-1,0) AND DateTime < DATEADD(qq,DATEDIFF(qq,0,GETDATE())-0,0)Step 2: Add the Amazon Redshift cluster public key to the host's authorized keys file; Step 3: Configure the host to accept all of the Amazon Redshift cluster's IP addresses; Step 4: Get the public key for the host; Step 5: Create a manifest file; Step 6: Upload the manifest file to an Amazon S3 bucket; Step 7: Run the COPY command to load the dataRedshift results: Athena results: Read Query 1: Simple Select. mwdb • 1 yr. Amazon Redshift treats decimal values as if they are different static types and allows all mathematical operations. 1. 0. This would be equivalent. 0. user where createddate >= '2019-09-01' and createddate <= '2019-09-30'. The function returns an INTEGER to indicate the number of matching characters between the Soundex codes. Redshift DATEDIFF Function. timeworkedfrom >= date_trunc ('month', current_date) - interval '6. In MySQL, we can use SEC_TO_TIME () to do this conversion easily. dateDiff takes two dates as arguments. A column or expression that evaluates to a data type of TIMESTAMP, TIMESTAMPTZ, TIME, or TIMETZ. DATEDIFF(), and TRUNC. Pramit is a Technical Content Lead at Chaos Genius. DATEDIFF. Create 1 day ranges new_start and new_end. However, since the requirement is to generate monthly reports which I would. *, datediff (second, start_date, end_date) / 60. If one of the operands is a floating-point number, then Amazon Redshift promotes the other operand to a floating-point number and. It assumes that two given dates are business days. MONTHS_BETWEEN function. AWS Collective See more. It appears that Redshift supports two possible functions for computing a time interval distance between two DATE -like objects: DATEDIFF () & date_diff (). This function is especially useful for calculating intervals, such as the number of days between two dates or the hours between two timestamps. 000 DATEDIFF(DD, startdate, ISNULL(enddate, getdate())) i was getting -2182 IS there any thing i need to fix the query · If you want the datediff to always return positive. Database code changes should be tracked in the same version control system as application code. Join is very useful and important to join the tables in redshift. 2. how many days exist between date number one and date number two) you’d use something like DATE_DIFF(‘day’, ‘2019-01-01’, ‘2019-01-06’). 1. What is the Amazon Redshift DATEDIFF function? The Amazon Redshift DATEDIFF function returns the difference between the date parts of two date or time expressions. The input timestamp is truncated to the precision of the input datepart. The example above shows the result of DATE_DIFF for two days in succession. This often happens only for a few minutes. Skipping weekends. 3333 etc. You can also Export your results. The first 6 is the difference (in months) between 01/10/2018 (October 1, 2018) and 30/04/2019 (April 4, 2019). Amazon Redshift interprets the DECADE or DECADES DATEPART based on the common calendar. Sign up for free to join this conversation on GitHub . The Amazon Redshift version when the query ran. At this time, Amazon Redshift version 1. most_recent) However, I am running into issues where the timestamp is the same. Push out all due dates by one week. This is the documentation for the Amazon Redshift Developer Guide - amazon-redshift-developer-guide/r_DATEDIFF_function. id = d. Snowflake is a complete SaaS offering that requires no maintenance. For example, the join condition pg_database. 0. PostgreSQL - Date Difference in Weeks. Add a comment. However when i run the same logic on actual data. The COPY command is able to read from multiple data files or multiple data streams simultaneously. *, lead (description) over (partition by company_id, user_id order by timestamp) as next_description, lead (timestamp) over. This is the documentation for the Amazon Redshift Developer Guide - amazon-redshift-developer-guide/r_DATEDIFF_function. format A string literal that defines the format of the input string , in. select DATEDIFF(second, sysdate, sysdate + interval '30 seconds') select DATEDIFF(minute, sysdate, sysdate + interval '20 minutes')Redshift is designed for analytic workloads and delivers fast query and I/O performance for any dataset by using 2 key techniques ; columnar storage and massive parallel processing. Currently, my code just returns zero on the right side of the decimal place. Follow. datepart. Each cluster runs an Amazon Redshift engine and contains one or more databases. Amazon Redshift doesn't validate POSIX-style time zone specifications, so it is possible to set the time zone to an invalid value. 90) within group (order by datediff(day, START_DATE, END_DATE) I am guessing that the problem is the date difference. The values in the CALDATE column are dates. Trunc function works on both date and numeric types. This function takes two date values and returns the difference between them in the unit specified by the ‘date part’. Formats that include a time zone ( TZ, tz, or OF) are not supported as input. state and a. Modified 3 years, 7 months ago. I know this is a simple question, but I just started to explore Redshift and couldn't google the answer yet. date_from, evnt. I need to find the difference between start_date_time and end_date_time, such that, if difference is 1 day, then result should be 1. If you're experiencing performance issues in your Amazon Redshift cluster, consider the following approaches: Monitor your cluster performance metrics. product_name, (EXTRACT (year FROM age ('2020-12-20'::date, MAX (iv. select to_date ('02 Oct 2001', 'DD Mon YYYY'); to_date ------------ 2001-10-02 (1 row) The following SQL statement converts the string 20010631 to a date. SELECT * FROM tickets t LEFT JOIN d_customer c ON c. When an input value includes a time zone, Amazon Redshift uses the time zone to convert the value to UTC and stores the UTC value. DATEDIFF returnes the number of full weeks between the datetime values. Again, the expected results would be a value of 1. It is constructed with this syntax: DATEDIFF ( datepart, {date|time|timetz|timestamp}, {date|time|timetz|timestamp} ) Implementing DATEDIFF in Redshift simply computes the difference between two dates or timestamps. DATEDIFF. El nombre predeterminado de la columna para la función DATEDIFF es DATE_DIFF. The terms derive from the colours red and. Using Kafka as your data. 0. md at master · awsdocs/amazon-redshift. *, g. 6) but when I execute it in Redshift as UDF, it gives me incorrect output. trunc (created_at_date) between '2014-06-01' and '2014-06-30'; 3. Collectives™ on Stack Overflow. Sorted by: 0. Type compatibility and conversion. The default Redshift date format is YYYY-MM-DD. Learn more about CollectivesCurrently, my code just returns zero on the right side of the decimal place. Saved searches Use saved searches to filter your results more quicklyStrange SQLite does not have a DATEDIFF function. 00. SELECT (EXTRACT(epoch from age('2017-6-15', now())) / 86400)::intThe popular one here is DATE_DIFF(): DATE_DIFF() – get the difference between two dates in any specificity (days, years). Redshift Create Table; Redshift DateDiff; ADVERTISEMENT. answered Mar 2, 2016 at 6:53. In certain cases, such as string-based comparisons or when a result depends on a different timestamp format than is set in the session parameters, we recommend explicitly converting. For example, the dateadd() is one of the functions provided by Redshift. This sql will give you the number of days between two dates as integer:. So, you cannot do what you want that simply. According to our Support Engineers, you need to identify the session, PID responsible for the lock. In Google BigQuery and Amazon Redshift, the <date_part> is passed in as the first argument and the <date/time field> is the second argument. Weekends. Redshift is available based on a subscription payment model. redshift_sample_sp AS $$ DECLARE rowcount INT ; rwnm INT; printval INT ; rec RECORD; days_supplied INT; sp_id INT; lh_patient_id1 INT; ship_dt DATE;. Use DATEDIFF to get the seconds between the two datetimes: DATEDIFF(second,'2014-09-23 00:00:00. This question. Create 1 day ranges new_start and new_end. Create timestampdiif function in Redshift. createddate, table2. Like most other SQL functions, you need to pass in arguments; for the DATE_PART function, you’ll pass in a date/timestamp/date field that you want to extract a date part from and specify the part you want removed. SELECT TIMESTAMPDIFF (SECOND, '2010-01-01 10:10:20', '2010-01-01 09:45:59') AS SECONDDIFFERENCE;I have to compare 2 separate columns to come up with the most recent date between them. person_id. 0. A fully managed No-code Data Pipeline platform like Hevo Data helps you integrate and load data from 100+ different sources (including 40+ free sources) to a Data Warehouse such as Amazon Redshift or Destination of your choice in real-time in an effortless manner. Write resolution instructions: Use bullets, numbers and additional headings Add Screenshots to explain the resolution Add diagrams to explain complicated technical details, keep the diagrams in lucidchart or in google slide (keep it shared with entire Snowflake), and add the link of the source material in the Internal comment section Go in. To calculate the difference between the subfields of the date, Amazon Redshift has the function datediff. 1. The following example table TIME_TEST has a column TIME_VAL (type TIME) with three values inserted. DC2. Compare this with RDS, which reaches 100 gibibytes to 64 TB for most database engines. 0 if the difference is less than 1 and the difference as a floating point number otherwise, modify your query as follows: SELECT distinct u2. 5 for 1/1/2016. See Presto documentation for date_diff()-- the unit is regular varchar, so it needs to go in single quotes: date_diff('day', ts_from, ts_to) Share. For more information about how Amazon Redshift SQL differs from PostgreSQL, see Amazon Redshift and PostgreSQL. Especificamente, DATEDIFF determina o número de limites da parte da data que são cruzados entre duas expressões. Redshift doesn't support column data type alteration, so to do this you have to recreate the table DDL with timestamp data type for time columns, insert data to the new table and replace the old table with it. replace (tzinfo=None), cast (MyTable. 0 Kudos. Let’s look at the syntax, examples, and use cases of Redshift DATEDIFF function: Specifically, DATEDIFF determines the number of date part boundaries that are crossed between two expressions. If the result is positive, the Secure Agent returns negative values and if the result is negative, the positive value is returned. SELECT DATEDIFF (YY, DateOfBirth, GETDATE ()) - CASE WHEN RIGHT (CONVERT (VARCHAR (6), GETDATE (), 12), 4) >= RIGHT (CONVERT (VARCHAR (6), DateOfBirth, 12), 4) THEN 0 ELSE 1 END AS AGE. If you do not want to skip the rows, you will need to load the date into a VARCHAR field (which will not cause an error) and later you will need to convert the VARCHAR into a DATE. Create a custom policy that allows calling redshift:GetClusterCredentials and restricts the resource to a given value for DbUser. Snowflake vs Redshift - learn 10 differences between these DW. [GetBussinessDays] ('02/18/2021', '03/06/2021') -- 11 days CREATE or. If you want to get 1. The data that is used by the job depends on the data type of a particular column. Redshift クエリのパフォーマンス分析. DateDiff Bigint Datetime in Redshift for Min Difference. rahulbmv. Add a policy that denies permission to redshift:GetClusterCredentials. You may change this: AND be. The base case is one the first interval and if both dates are on the same day then you dont need change anything. 例如，假设您计算. Datetime types. The best way to approach this requirement would be to Create a Scalar Python UDF - Amazon Redshift that takes an input of two dates, then outputs the difference. The following code makes use of concatenation and type casting to achieve the results we need! select (datediff ('sec', created_at, first_purchase_at)::varchar || ' second' )::interval from users. datediff (year, dob, current_date + interval '1 year' - interval '1 day') as age. In the example the fixed_date is '2020-12-20' and I am using it my query. How do I go about getting the first date of current year using Redshift? I am familiar with T-SQL/SQL in SSMS but I am not entirely sure how to do this in Redshift. The DATETIME_DIFF arguments are datetimes, not dates; Snowflake, Redshift, and Databricks’ DATEDIFF functions support multiple date types such as dates and timestamps. 1. thank you. Note that unit values can be different in SQL Server DATEDIFF and MySQL TIMESTAMPDIFF. Share. SELECT t1. An identifier literal or string of the specific part of the date value (for example, year, month, or day) that the function operates on. 2 Answers. datediff 関数のデフォルトの列名は date_add です。日付の値に使用するデフォルトのタイムスタンプは 00:00:00 です。 次の例では、タイムスタンプを指定しない日付の値に 30 分を追加します。Amazon Redshift doesn't validate POSIX-style time zone specifications, so it is possible to set the time zone to an invalid value. HLLSKETCH type. 00. For instance, one contrasting comparison is that Amazon Redshift Serverless doesn't have the concept of a cluster or node. This example assumes that the current date is June 5, 2008. Sorted by: 1. DATEDIFF. Refer Redshift documentation for more details. The parameterized snippet below can be used to find the number of weekdays between 2 dates. Create timestampdiif function in Redshift. If you want to do it day, do it following way select datediff(day,order_date,complain_date) as diff_in_day from your_table; You could use datediff function to update your table column time_duration. So my condition for each week will be like this if I run it manually for each of. 53. The opposite change, a decrease in wavelength and simultaneous increase in frequency and energy, is known as a blueshift, or negative redshift. The Redshift Datepart function returns the interval value as an integer. I attached a screenshot showing the Form Sent Date (10/14/2020) and Form Complete Date (11/13/2020). *First need to sort both files: proc sort data=data_333; by client id; proc sort data=test_data; by client id; *then need to merge and get differences; Data Test; MERGE data_333 (in=a) test_data (in=b);Converting Valid Character Strings to Dates, Times, or Timestamps. For example, if you are calculating the difference in years between two dates, 12-31-2008 and 01-01-2009, the function returns 1 year despite the fact that these dates are only one day apart. tobymao closed this as completed in #1746 3 weeks ago. In my Redshift table I have 2 columns that stores timestamp values: start_date_time and end_date_time. Redshift MySQL Differences: Performance. Redshift will place the query in a paused state temporarily. 1. This function is especially useful for calculating intervals, such as the number of days between two. db_id matches the internal database object ID for each PG_DATABASE. Comparison conditions state logical relationships between two values. A Soundex code is a string that is four characters long. Your highlighted WHERE clause logic is comparing timeworkedfrom to a date six months earlier than the first of the current month. The syntax includes the following components: <condition> –The conditional statement. d[S+] Lists local user created tables, regular views, late-binding views and materialized. datediff () counts the number of boundaries that are crossed between the two date expressions given as second and third argument, expressed in the unit given as first argument. The difference between 1st. The Overflow Blog CEO update: Giving thanks and building upon our product & engineering foundation. Use the TIMESTAMPTZ data type to input complete timestamp values that include the date, the time of day, and a time zone. 2. I have an example of such in a recent answer: Cross join Redshift with sequence of dates. This can be replace by a recursive CTE (or keep a "dates" table on your database). Some of the most useful functions in Postgres implementations of SQL (like Amazon Redshift)are DATE_DIFF and DATE_TRUNC: DATE_DIFF gives the amount of time that has elapsed between two different dates. select to_date ( '20010631', 'YYYYMMDD', FALSE ); The result is July 1, 2001, because there are only 30 days. Yes. The input timestamp is truncated to the. Variable, up to 128 bits for uncompressed DECIMAL types. For Amazon Redshift Serverless, some concepts and features are different than their corresponding feature for an Amazon Redshift provisioned data warehouse. First, we need to open the query editor and console. However, whereas Snowflake is a SaaS offering, Redshift is a PaaS (Platform-as-a-Service) solution. numbers WITH RECURSIVE number_series (number) AS ( SELECT 1 UNION ALL SELECT number + 1 FROM number_series. Compares two dates or timestamps and returns the difference in days. 2. select id, state from data a join (select state, max (time) as most_recent from data group by 1) b on a on a. This question is in a. Learn how to convert timestamps from one time zone to another in Amazon Redshift using the convert_timezone() function. Now I am trying to make this query dynamic such that it can give me count for past 6 weeks something like below as an output: Count Week ------------ 124 W43 125 W42 126 W41 127 W40 128 W39 129 W38. Sorted by: 1. Find out key distinctions in architecture, performance, scaling, pricing—and more! SELECT * FROM schemaName. Specifically, DATEDIFF determines the number of datepart boundaries that are crossed between two expressions. date_from) = 1. The usage of the datediff is similar in all the databases except for the parameters that we. Feat (redshift,presto): transpile DATEADD, DATEDIFF to presto #1746. For the rest I use new_start and new_end - 1 second. While migrating the code from Redshift you will need to rewrite this function in Bigquery. DATEDIFF(DAY, '8/4/2014', '8/5/2014') +1 You need to add 1 to the DATEDIFF function and it will work as you want. Amazon Redshift accepts different date formats, including ISO date time strings. A date field or a call to. date1, t2. For example, if AUTO distribution style is specified, Amazon Redshift initially assigns the ALL distribution style to a small table. A COPY command is the most efficient way to load a table. date 1. Also have a dates table with all calendar dates that can be utilized. Date and Min Item number RELATED that that date. The formula assumes that Saturday and Sunday are not business days. If the result is positive, the Secure Agent returns negative values and if the result is negative, the positive value is returned. purchase_date) between 0 and 2 ORDER BY. Example: select months_between ('1969-03-18', '1969-01-18') as months; You can read more about this in the redshift documentation. 338+ Hours of HD Videos 54 Courses 4 Mock Tests & Quizzes Verifiable Certificate of Completion Lifetime Access 4. In my Redshift table I have 2 columns that stores timestamp values: start_date_time and end_date_time. To view a list of supported time zone names, run the following command. PDF RSS. If you just add time parameter up to, how many digits your need after seconds like below. Amazon Redshift interprets the DECADE or DECADES DATEPART based on the common calendar. cust_id = t. Internally Data Services reads both the date and the time when it runs a sysdate function. Note: As TT rightfully wrote in his comment,. Month name (uppercase, mixed-case, lowercase, blank. date, d. Aug 17, 2021 at 11:13. Improve this answer. person_id = t2. If you want to retain the log data, you will need to periodically copy it to other. PROGRAMMING LANGUAGES Course Bundle - 54 Courses in 1 | 4 Mock Tests. I am able to convert above query in dynamic way which gives me the count for previous week which is 43 and it works fine. And only do that for one day ranges. The first argument to datediff () in Redshift is a keyword. create user user 1 password 'md 5153 c 434 b 4 b 77 c 89 e 6 b 94 f 12 c 5393 af 5 b'; Log on to the database using the sign-in credentials. Boolean type. These strings can contain datetime separators (such as ' - ', ' / ', or ': ') and the following "dateparts" and. Expected Results: 12. This question is in a collective: a subcommunity defined by. Transforming date with Redshift. select *, cast ( (cast (begin_date as date) - cast (end_date as date) YEAR) as decimal (3,2)) AS year_diff from x. Redshift Date functions: LAST_DATE function. PERCENTILE_CONT(0. DATE ()関数 - 日付部分の抽出 時刻情報を除いて、年月日の部分だけを取得したい場合に便利です。. 2. For example, the following code would give the number of days between date1 and date2: DATE_DIFF is great for calculating the. Consider SQL Server function to calculate the difference between 2 dates in months: SQL Server : -- Difference between Oct 02, 2011 and Jan 01, 2012 in months SELECT DATEDIFF ( month, '2011-10-02', '2012-01-01') ; -- Result: 3. Step 2: Add the Amazon Redshift cluster public key to the host's authorized keys file; Step 3: Configure the host to accept all of the Amazon Redshift cluster's IP addresses; Step 4: Get the public key for the host; Step 5: Create a manifest file; Step 6: Upload the manifest file to an Amazon S3 bucket; Step 7: Run the COPY command to load the data5. set timezone to ‘xxx36’; Examples. Number of weekdays between two dates - StartDate question. In the elastic resize, the cluster will be unavailable briefly. BigQuery also supports a separate DATE_DIFF function that will return the difference between two date types, unlike the DATETIME_DIFF that only supports the datetime type. Amazon Redshift supports the comparison operators described in the following table: Value a is less than value b. Both data warehouse platforms offer online support, but Snowflake also provides 24/7 live support. The time zone can be specified as a time zone name (such as 'Africa/Kampala' or 'Singapore') or as a time zone abbreviation (such as 'UTC' or 'PDT' ). this continues till the end of the week. The first expression in a range condition must be the lesser value and the second expression the greater value. It calculates the difference in years between the birth date and the date in one year (minus one day) to account for partial years. Por exemplo, suponha que você esteja calculando a diferença em anos entre duas datas, 12-31-2008 e 01-01-2009. datediff (year, dob, current_date + interval '1 year' - interval '1 day') as age. Per ulteriori informazioni, consultare Parti di data per funzioni di data e timestamp. Is there a quick function for that? I tried to do: select date ( (sysdate - cast ('5 hour' as interval))) This is returning only the date part. Amazon Redshift allocates the workload to the cluster nodes and. DATE_DIFF function Examples. These strings can contain datetime separators (such as ' - ', ' / ', or ': ') and the following "dateparts" and "timeparts". Redshift is designed and optimized to store and access much larger data sets than RDS. すでに実行されたSQLを分析したい場合は、そのSQLを実行した接続ユーザ（もしくはスーパーユーザ）でRedshiftに接続し、. In Redshift, you can use datediff () and arithmetics: select t. I need to calculate the total length in terms of Hours, Minutes, Seconds, and the average length, given some data with start time and end time. date) between -60 and 0 group by 1 ) select t1. sql. How to use Redshift DATEDIFF? 0. createddate, table2. select to_date (year_to_month,'yyyymm') - interval '12' month. Here its 0. 543081, my output should be 2019-03-01 11:17:57. 00274 because of the leap year. You can use the Redshift date format functions to convert the string literals, integer, date/time etc to required format. Redshift query between date. A string literal that defines the format of the timestamp value. I ran this in Redshift: SELECT FLOOR(DATEDIFF(day, '2022-01-01', '2023-01-01')/365) as age --1 (this seems right) SELECT FLOOR(DATEDIFF(day, '2022-01-01', '2023-01-01. Spark & PySpark SQL provides datediff() function to get the difference between two dates. SELECT iv. select pg_timezone_names (); To view a list of supported time zone. 4-digit, 3-digit, 2-digit, 1-digit International Organization for Standardization (ISO) year number. timestampdiff (a text,b timestamp, c timestamp ) RETURNS INT AS $$ BEGIN case when a=second then datediff (second,b,c) when a=minute then. I want to calculate the months_in_inventory by calculating the difference between a fixed_date and the inventory_date. Anybody help what is the equivalent of Dateadd and Datediff in DBeaver or anybody can convert this code in DBeaver. I think you need an alias for your subquery. However, this is not the case. That isn't the same. 3. When using the Redshift connector with DirectQuery and the DATEDIFF function I receive the following error: Release: April 2020 Product Version:In this post, we will look at Date functions in Redshift - specifically the Redshift DATEDIFF and DATEADD functions with syntax and practical use cases of using these functions. You can use the Redshift date format functions to convert the string literals, integer, date/time etc to required format. The syntax of creating the temporary table by using this method is as shown below –. Need to set max_recursion_rows else redshift will stop you from doing too deep of a recursion. It’s based on PostgreSQL 8. 0 is for 1/1/1900, and getdate is the current date --(i used a set date bc dates will change as this post gets older). select dateadd (m,30, '2008-02-28' ); date_add --------------------- 2008-02-28 00:30:00 (1 row) You can name date parts in full or abbreviate them. BigQuery also supports a separate DATE_DIFF function that will return the difference between two date types, unlike the DATETIME_DIFF that only supports the datetime type. DATE: Dates without the time part. <code_block1> – The code block. BigQuery also supports a separate DATE_DIFF function that will return the difference between two date types, unlike the DATETIME_DIFF that only supports the. The rub is that one date is a converted integer value in YYYYMMDD format and the second date field is a timestamp. 000', @EndTime datetime = '2016-05-10 03:31:00. One of the toughest pitfalls of real-time data streaming is: how best to work with both real-time and historical data. date_from, evnt. Amazon Redshift is specifically designed for online analytic processing (OLAP) and business intelligence (BI) applications, which require complex queries against large datasets.