How do I add a column to a specific position in hive?

How do I add a column to a specific position in hive?

ALTER TABLE table_name ADD COLUMNS (user_id BIGINT); Now to make user_id column as the first column in your table use change column with FIRST clause: ALTER TABLE table_name CHANGE COLUMN user_id user_id BIGINT first; This will move the user_id column to the first position.

How do I add a column in SQL Developer?

First, you specify the name of the table, which you want to add the new column, after the ALTER TABLE clause. Second, you specify the column name, data type, and its constraint.

Why Hive column should not be added like ALTER TABLE?

If you add a column to a hive table, only the underlying metastore is updated. I hope this helps. ALTER TABLE commands modifies the METADATA only. The underlying data remains untouched.

How do I change the partition column data type in Hive?

The easiest way I can see is to:

1. drop the table (since it is external, data should NOT be dropped)
2. create a new table on top of it and specify as partitioned by ColumnA of type timestamp (the column name should remain the same as before, can’t be changed to ColumnB, otherwise step 3 will not be able to pick it up)

How to add a column at a specific position in a table?

To add a column at a specific position within a table row, use FIRST or AFTERcol_name. The default is to add the column last. You can also use FIRST and AFTER in CHANGE or MODIFY operations to reorder columns within a table. I googled for this for PostgreSQL but it seems to be impossible.

How can I specify the position for a new column in PostgreSQL?

Then the column is added after the created_date column. Is there any way I can specify the position for the new column? e.g. so I can add it after name and get a table like: ALTER TABLE ADD COLUMN will only add the new column at the end, as the last one.

How can I change the position of a column in SQL Server?

You can modify the column’s position by using GUI. Suppose you have created the column in T-SQL, right-click the table in SQL Server Management Studio. Click Design. Highlight the column in the last row and drag it to the position where you want. Hope it helps.

Can you add columns to the end of a table?

There is no reason you cannot add the columns to the end of the table. The column position has nothing to do with anything in SQL Server. The only time the position is an issue is when you use SELECT *. If you specify the column names instead, you can specify the column names in any order.