I need to split the table into partitions, namely into three partitions according to the EVENT_TIME field, where the first partition is an interval of a week from today, the second last week and the third partition is history, where data that does not pass into the first two partitions are placed. In addition, I need to add a trigger
Tag: partitioning
AVG over time Window in Impala … OVER (PARTITION BY … ORDER BY)
I have a Table in Impala in which I have time information as UnixTime with a frequency of 1mSec. I am trying to get the AVG(), MIN() and MAX() for a window of 10Sec (But I do not want to fix it and can be 20sec, 30sec, etc). I am doing it using sub-queries but I am not getting the
How do I find first value in every last 3 months in Hive
I have a table like below. I need to get the first Refresh_value (based on Refresh_date) from last 3 months starting from the last date and there should be 2 additional columns (Group and Refresh_Value_Min) where 1st column will have the first value from every last 3 months and another column will have values which says in which group these
Custom SQL for quarter count starting from previous month
I need to create a custom quarter calculator to start always from previous month no matter month, year we are at and count back to get quarter. Previous year wuarters are to be numbered 5, 6 etc So the goal is to move quarter grouping one month back. Assume we run query on December 11th, result should be: YEAR MNTH
Amazon Athena returning “mismatched input ‘partitioned’ expecting {, ‘with’}” error when creating partitions
I’d like to use this query to create a partitioned table in Amazon Athena: Unfortunately I don’t get the error message which tells me the following: line 3:2: mismatched input ‘partitioned’ expecting {, ‘with’} Answer The quotes around ‘PARQUET’ seemed to be causing a problem. Try this:
Partitioned by gives me error column duplicated when creating external table
I’m creating an external table using ‘partitioned by’ but I get the following error: ‘Invalid operation: column “#id” duplicated’ I first thought it could have something to do with the character #, …
How to join two tables based on FIRST VALUE of a group
Objective: I would like to join two tables based on the first value of Id column grouped by subscription Id column ordered by created_at column. Situation: Table1 looks like this: id channel …
What is the best way to partition large tables in SQL Server?
In a recent project the “lead” developer designed a database schema where “larger” tables would be split across two separate databases with a view on the main database which would union the two …