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To enhance read performance and reduce disk usage, TiDB automatically schedules data compaction on storage nodes in the background. During the compaction, storage nodes rewrite physical data, ...

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 ...

A constraint-name must not identify a constraint that was already specified within the same ALTER TABLE statement, or as the name of any other existing constraint on the table (SQLSTATE 42710). If the ...

Commonly used DDL in SQL querying are CREATE, ALTER, DROP, and TRUNCATE. Create. This command builds a new table and has a predefined syntax. ... The first one is used with the ALTER TABLE statement ...

ALTER TABLE - alters a database table DROP TABLE - deletes a database table CREATE INDEX - creates an index (search key) DROP INDEX - deletes an index SQL also has syntax to update, insert, and delete ...

It is also useful if you are running SQL statements from an SQL application in another SQL-based database. The second form uses a LIKE clause to create a table that has the same column names and ...

SQL Reference. ALTER TABLESPACE. The ALTER TABLESPACE statement is used to modify an existing table space in the following ways. Add a container to a DMS table space (that is, one created with the ...