ADD COLUMN The ALTER TABLE.. ADD COLUMN statement adds a column to an existing table. This operation is online in TiDB, which means that neither reads or writes to the table are blocked by adding a ...

When you alter the attributes of a column and an index has been defined for that column, the values in the altered column continue to have the index defined for them. If you drop a column with the ...

Fixes cockroachdb#32917. This PR adds support for the add column references statement by allowing the foreign key building code to use columns and indexes added in the current txn. The schema changer ...