ALTER TABLE表格名稱ADDCOLUMN直欄定義BEFORE直欄名稱ALTERCOLUMN直欄變更DROPCOLUMN直欄名稱CASCADERESTRICTADD唯一限制參照限制核對限制DROPPRIMARY KEYUNIQUEFOREIGN KEYCHECKCONSTRAINTconstraint-nameCASCADERESTRICTADD分割子句DROP PARTITIONINGADD PARTITION新增分割區ALTER PARTITION分割區名稱界限規格媒體喜好設定記憶體喜好設定DROP...
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.
Alias data types are created with the CREATE TYPE statement before they can be used in a table definition. A .NET Framework user-defined type, and the schema to which it belongs. .NET Framework user-defined types are created with the CREATE TYPE statement before they can be used in a ...
The SELECT, DELETE, and ALTER privileges, and The USAGE privilege on the schema containing the source table Database administrator authority To detach a partition, the privileges held by the authorization ID of the statement must include at least one of the following: The privilege to create in...
ALTER TABLE t2 DROP COLUMN c, DROP COLUMN d; If a storage engine does not support an attempted ALTER TABLE operation, a warning may result. Such warnings can be displayed with SHOW WARNINGS. See Section 13.7.5.40, “SHOW WARNINGS Statement”. For information on troubleshooting ALTER TABLE, se...
the followingSQL statementcan be used : SQL Code: ALTER TABLE agent1 -- Add a new column named 'email' with a data type of CHAR(25) ADD email CHAR(25); Explanation: ALTER TABLE agent1: Begins the SQL statement to alter the structure of the existing table named 'agent1'. ...
AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterColumnStatement 建構函式 屬性 AlterTableAlterColumnOption 定序 ColumnIdentifier DataType 加密 GeneratedAlways IsHidden IsMasked MaskingFunction 選項 StorageOptions 方法 AlterTableAlterIndexStatemen...
AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterColumnStatement 构造函数 属性 AlterTableAlterColumnOption 排序规则 ColumnIdentifier 数据类型 Encryption GeneratedAlways IsHidden IsMasked MaskingFunction 选项 StorageOptions 方法 AlterTableAlterIndex...
ALTER TABLE t2 DROP COLUMN c, DROP COLUMN d; If a storage engine does not support an attempted ALTER TABLE operation, a warning may result. Such warnings can be displayed with SHOW WARNINGS. See Section 15.7.7.42, “SHOW WARNINGS Statement”. For information on troubleshooting ALTER TABLE, se...
AlterServerRoleStatement AlterServiceMasterKeyOption AlterServiceMasterKeyStatement AlterServiceStatement AlterSymmetricKeyStatement AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterColumnStatement 构造函数 属性 AlterTableAlterColumnOption...