affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> select * from t_index_drop force index(idx_age_name); ERROR 1176 (42000): Key 'idx_age_name doesn't exist in table 't_index_drop' 如果删除字段,索引也会自动删除。 mysql> alter table t_index_drop add index idx_age...
DROP OPENXML VALUES DUMP OPTION VARYING ELSE OR VIEW END ORDER WAITFOR ERRLVL OUTER WHEN ESCAPE OVER WHERE EXCEPT PERCENT WHILE EXEC PIVOT WITH EXECUTE PLAN WRITETEXT 此外,ISO 标准定义了保留关键字列表。不要使用 ISO 保留关键字作为对象名和标识符。ODBC 保留关键字列表(如下表所示)与 ISO 保留关键字...
Using existing history tables with ledger tables isn't allowed. REMOTE_DATA_ARCHIVE = { ON [ ( table_stretch_options [ ,... n ] ) ] | OFF ( MIGRATION_STATE = PAUSED ) } Applies to: SQL Server 2016 (13.x) and later. Creates the new table with Stretch Database enabled or ...
If a table with the same name as the one to be copied already exists in the destination Oracle database, then: If the two tables do not have the same column definitions, the copy is not performed. If the two tables have the same column definitions and if Include Data was specified, th...
The PL/SQL block inExample 6-10queries multiple values into PL/SQL tables, with and without bulk binds. Without bulk bind, PL/SQL sends a SQL statement to the SQL engine for each selected employee, leading to context switches that slow performance. ...
One way to query multiple tables is to write a SELECT statement with multiple table names seperated by a comma. This is also known as a "cross join". When querying more than one table, column names need to be specified by table_name.column_name. ...
DROP OPEN WHERE ELSE OPTION WITH END OR WORK END-EXEC ORDER WRITE ESCAPE OUTER YEAR EXCEPT OUTPUT ZONE EXCEPTION 未來關鍵字 下列關鍵字可能保留給 SQL Server 實作新功能的未來版本。 請考慮避免使用這些字做為識別碼。 ABSOLUTE HOST RELATIVE ACTION HOUR RELEASE ADMIN IGNORE RESULT AFTER...
CREATE TABLE、DROP TABLE、CREATE STATISTICS、DROP STATISTICS、CREATE VIEW 和 DROP VIEW 是外部表中允许的唯一数据定义语言 (DDL) 操作。 Azure Synapse Analytics 的限制与局限 在Azure Synapse Analytics 专用 SQL 池和 Analytics Platform System 中,PolyBase 在运行 32 个并发 PolyBase 查询时,可以在每个文件...
You can update global indexes on heap-organized tables during this operation using the update_global_index_clause. If you specify the parallel_clause with the update_global_index_clause, Oracle parallelizes the index update, not the drop operation. ...
Copy same data into multiple rows copy stored procedures from one schema to another in a sql server database through batch Copy table from one server to another Copy table Structure including primary keys, index etc. Copy tables with all constraints Correct way to run multiple sql scripts from...