ALTERTABLEmytableDROPcolumn_to_be_deleted; Renaming the table If you need to rename the table itself, you can also do that using theRENAME TOclause of the statement. Altering table name ALTERTABLEmytableRENAMETOnew_table_name; Other changes ...
ALTERTABLEclientsALTERstateDROPDEFAULT; This particularDROPdoesn't delete data, by the way. Indexes One of the most irritating tasks in making changes to a table for newcomers is dealing with indexes. If they try to rename a column that is indexed by only using anALTER TABLEstatement like we...
When you use the MODIFY clause, you can also alter the structure of other tables. If the modified column is referenced by other tables, those referential constraints are dropped. You must add those constraints to the referencing tables again, using the ALTER TABLE statement. When you change t...
SQLite supports a limited subset of theALTER TABLEstatement. This statement in SQLite allows a user to rename a table or to add a new column to an existing table. It is not possible to rename a column, remove a column, or add or remove constraints from a table. sqlite> CREATE TABLE Na...
Complete the subsequent panels, and press Enter to run the ALTER TABLE statement. Related tasks Examples of altering a table by using the AL line command Altering a table by using the ALT line command Procedure To alter a table by using the ALT line command: ...
SQL Preview The SQL previewer shows the SQL statements for altering the table based on your input. The controls, such as the fields, pull-down menus and buttons, in the assistant are only enabled if the ALTER TABLE statement for the database holding the table provides a way to alter the...
OPTIMIZE TABLEis supported for partitioned tables. For information about using this statement with partitioned tables and table partitions, seeSection 23.3.4, “Maintenance of Partitions”. By default, the server writesOPTIMIZE TABLEstatements to the binary log so that they replicate to replication ...
FROM `table`` Exclude the second backtick when writing code on Stack Overflow to avoid interference with syntax highlighting. MySQL ALTER TABLE Statement, We use the following SQL statement: Example. ALTER TABLE Persons. ADD DateOfBirth date; Notice that the new column, "DateOfBirth", is of...
⚈ This discussion assumes you can walk through the original table using an explicitPRIMARYorUNIQUEkey. ⚈ Single-column (not 'compound') key is used to walk through the table. ⚈ You have enough disk space to simultaneously hold both the original table and the new table(s). ...
This statement does not work with views. OPTIMIZE TABLE is supported for partitioned tables. For information about using this statement with partitioned tables and table partitions, see Section 23.3.4, “Maintenance of Partitions”. ...