I want to find previous date in Hive. For example : I have Date as 20180821 (yyyyMMdd) format, I want to find previous date of this in Hive. I tried date_sub() function, seems it works only with yyyy-MM-dd format. How to solve my issue. Please help Answer In addition to already provided solution with unix_timestamp conversion, please consider also this.
Tag: hive
How to join single table with multiple columns in Hive?
I have 2 tables: one has exchange rates (to GBP), the other has various amount columns with different currencies. I am joining these two tables and display all amount values in GBP, but I get nulls …
To compare count between two hive table
I am trying to do count comparision between two table . As minus operator does not work in hive , it is not happening. Could you please give some simple way to do count comparision between two tables. …
Calculate time difference between two columns of string type in hive without changing the data type string
I am trying to calculate the time difference between two columns of a row which are of string data type. If the time difference between them is less than 2 hours then select the first column of that row else if the time difference is greater than 2 hours then select the second column of that row. It can be
Remove nulls from an array in SQL
Want to remove nulls from an array in hive/sql for example : array is [‘1’,null] after converting to string values it should be ‘1’ only. to split the array I am using below: concat_ws( “,”, …
How to prevent sql without limit in Hive?
Many users are used to using ‘select * from tables’ in oracle/mysql But i should not allow them to query like that in hive Is there any way to prevent a full_table scan in hive? Like trigger or somethng else? Thanks a lot! Answer To prevent full table scan use these settings. Hive will generate exception if partition predicate is
How to convert a date format YYYY-MM-DD into integer YYYYMMDD in Presto/Hive?
How to CONVERT a date in format YYYY-MM-DD into integer YYYYMMDD in Presto/Hive? I am trying to convert the below list into YYYYMMDD integers WITH all_dates as (SELECT CAST(date_column AS …
How to find duplicate rows in Hive?
I want to find duplicate rows from one of the Hive table for which I was given two approaches. First approach is to use following two queries: second query is as below which will give count of distinct rows With this approach, for one of my table total row count derived using first query is 3500 and second query gives
Deleting Part of a string in HIVE
I am trying to delete a part of a string in HIVE. I want to delete the last eleven characters for all records in a column. The data looks like: 1018492743|0001-01-01 I want it to look like: 1018492743 The code I have tried looks like: Select right(a.ord_id, len(a.ord_id)-ll) It isn’t working because len isnt a function in HIVE Another issue
Hive Create table – When to use VARCHAR and STRING as column data type
I am trying to create a HIVE table. I am not sure when we use VARCHAR and when we use String. If we use VARCHAR then do we have to define length like we define in RDBMS as VARCHAR(10) Please help Answer VARCHAR was introduced in Hive 0.12.0 for more SQL-compliant behavior, such as SQL string comparison semantics, max length,