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 ALTERTABLEmytableRENAMETO
Indexes are considered part of the table definition: The syntax ALTER TABLE ... ADD/DROP/ALTER INDEX is supported only for memory-optimized tables. Without using an ALTER TABLE statement, the statements CREATE INDEX, DROP INDEX, ALTER INDEX, and PAD_INDEX are not supported for indexes on ...
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...
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 an ALTER TABLE statement like we used earlier, they will get a frustrating and confusing error message:...
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: ...
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 corresponding table attribute. For instance, for a database that only allows the size of a VARCHAR ...
⚈ 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). ...
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 ...
(However, you can import or create a table that uses a different storage engine, and then convert it to NDB using ALTER TABLE tbl_name ENGINE=NDBCLUSTER. In such a case, you must issue a FLUSH TABLES statement to force the cluster to pick up the change.)...
In SQL Server ( SQL Server 2016 (13.x) and later) and Azure SQL Database, you can performALTERoperations on natively compiled stored procedures and other natively compiled Transact-SQL modules such as scalar UDFs and triggers using theALTERstatement. ...