The ROWGUIDCOL for the table. A computed column or used in a computed column. Used in an index, unless the column is a varchar, nvarchar, or varbinary data type, the data type is not changed, the new size is equal to or larger than the old size, and the index is not the result ...
Later, to accommodate longer strings, you can alter the table to increase the size of the column. The following example increases the size of the EVENTNAME column to VARCHAR(300). alter table event alter column eventname type varchar(300);...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
table_name 要更改的表的名称。 如果表不在当前数据库中,或者不包含在当前用户所拥有的架构中,则必须显式指定数据库和架构。ALTER COLUMN 指定要更改命名列。 如果兼容级别等于或低于 65,则不允许使用 ALTER COLUMN。 有关详细信息,请参阅 sp_dbcmptlevel (Transact-SQL)。 修改后的列不能为下列任何一种列: ...
( column_name ) | filegroup | "default" } } <table_option> ::= { SET ( LOCK_ESCALATION = { AUTO | TABLE | DISABLE } ) } <filetable_option> ::= { [ { ENABLE | DISABLE } FILETABLE_NAMESPACE ] [ SET ( FILETABLE_DIRECTORY = directory_name ) ] } <stretch_configuration> ::=...
For more information, see Section 13.1.18, “CREATE TABLE Statement”. The word COLUMN is optional and can be omitted. Multiple ADD, ALTER, DROP, and CHANGE clauses are permitted in a single ALTER TABLE statement, separated by commas. This is a MySQL extension to standard SQL, which ...
size_clause::= Description of the illustration size_clause.gif shrink_clause::= Description of the illustration shrink_clause.gif upgrade_table_clause::= Description of the illustration upgrade_table_clause.gif (column_properties::=) records_per_block_clause::= ...
If the table has n columns, the ordinality of the new column is n+1. The value of n cannot be greater than 749. For a dependent table, n cannot be greater than 748. The column cannot be added if the increase in the total byte count of the columns exceeds the maximum row size. ...
-- Add a single column. ALTER TABLE [IF EXISTS] [<schema_name>.]<table_name> ADD COLUMN <new_column> <data_type>; -- Add multiple columns. ALTER TABLE [IF EXISTS] [<schema_name>.]<table_name> ADD COLUMN <new_column_1> <data_type>, ADD COLUMN <new_column_2> <data_type>; ...
ALTERIN privilege on the schema of the table or view DBADM authority To add a column of type DB2SECURITYLABEL to a table, the privileges of the authorization ID of the statement must include at least a security label from the security policy that is associated with the table. To remove the...