syntaxsql 복사 ALTER TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] } ) ] [ COLLATE collation_name ] [ NULL | NOT NULL ] } | ALTER INDEX ind...
Learn more about the Microsoft.SqlServer.TransactSql.ScriptDom.AlterTableAlterColumnStatement.AlterTableAlterColumnStatement in the Microsoft.SqlServer.TransactSql.ScriptDom namespace.
public boolean supportsAlterTableWithDropColumn() 返回值 如果支持,则值为 true。 否则为false。 例外 SQLServerException 备注 此supportsAlterTableWithDropColumn 方法是由 java.sql.DatabaseMetaData 接口中的 supportsAlterTableWithDropColumn 方法指定的。
public boolean supportsAlterTableWithAddColumn() 返回值 如果支持,则值为 true。 否则为 false。 例外 SQLServerException 备注 此supportsAlterTableWithAddColumn 方法是由 java.sql.DatabaseMetaData 接口中的 supportsAlterTableWithAddColumn 方法指定的。 另请参阅 SQLServerDatabaseMetaData 方法 SQLServerDatabase...
Add Column with the SQL ALTER TABLE STATEMENT The ALTER TABLE command supports adding columns to an existing table. Unless you specify a default value, the column should be defined as nullable. The T-SQL code below creates a new column namedWeightPoundsand uses an update statement to populate...
Until this index is created on the ROWID column, the insert, and update operations and the LOAD utility cannot be used to add rows to the table. If the table space name is not specified on the CREATE TABLE statement, Db2 implicitly creates the necessary object to make the table complete,...
CONTROL privilege on the table or view ALTERIN privilege on the schema of the table or view DBADM authority To add a column of type DB2SECURITYLABEL to a table, the privileges held by the authorization ID of the statement must include at least a security label from the security policy assoc...
从代码上可以看出,红色高亮语句虽然要求使用REORG,但不及时运行REORG还可以让后续的几个语句继续执行。原因是DB2允许最多三条语句处于Reorg Pending状态,假如去除第一个REORG,语句“ALTER TABLE my_test ALTER COLUMN sla_priority4_time DROP NOT NULL;”就会执行失败。
column-alteration: column nameSET DATA TYPE {VARCHAR | CHARACTER VARYING | CHAR VARYING} (integer) referential-constraint: FOREIGN KEY [constraint-name] (column-name[,...] REFERENCESreferenced-table[column-name,...] [ON DELETE {RESTRICT | CASCADE | SET NULL | NO ACTION}] ...
CREATE TABLE (Transact-SQL). Note If NULL or NOT NULL is specified with ALTER COLUMN,new_data_type[(precision[,scale])] must also be specified. If the data type, precision, and scale are not changed, specify the current column values. ...