However, I don't want to drop the entire database (because then I'd have to re-run the create script), nor do I want to delete all the tables in it (there is one table that needs to remain). In case it's of use to anyone, or I need to do this again, here's a snipp...
DROP TABLE can't be used to drop a table that is referenced by a FOREIGN KEY constraint. The referencing FOREIGN KEY constraint or the referencing table must be dropped first. Multiple tables can be dropped in the same DROP TABLE statement. If both the referencing table in a FOREIGN KEY co...
it deletes the entire records as well as the schema and structure of the table along with its named elements. The DROP command is a Data Definition Language (DDL) command. In addition, this command can also be used to drop databases. Databases or tables once dropped are wiped out of exis...
Multiple tables can be dropped in the sameDROP TABLEstatement. If both the referencing table in aFOREIGN KEYconstraint and the table with the referenced primary or unique key are being dropped in the sameDROP TABLEstatement, the referencing table must be listed first. ...
Multiple tables can be dropped in any database. If a table being dropped references the primary key of another table that is also being dropped, the referencing table with the foreign key must be listed before the table holding the primary key that is being referenced. ...
tables ;2)删除数据库删除数据库的语法，如下：drop database dbname ;例如，要删除test1数据库：drop ...
一、DROP 1、DROP CATALOG 2、DROP DATABASE 3、DROP TABLE 4、DROP VIEW 5、DROP FUNCTION 6、drop table示例 二、alter 1、ALTER DATABASE 2、ALTER TABLE 1)、建表 2)、ADD 1、增加单列示例 2、增加watermark列 3)、MODIFY 1、修改列 2、修改水印 4)、DROP 5)、RENAME 6)、SET 7)、RESET 3、AL...
5. Not using temporary tables for complex queries SQL would be great if only we could debug queries. What if I told you can debug them! You can breakdown a complex query and create multiple temporary tables. Then you can run “sanity check” queries against those tables to make sure they...
Created_tmp_disk_tables:创建内部磁盘临时表的数量; Created_tmp_tables:创建内部临时表的数量; Start/End:语句开始和结束时间 Tips:在MariaDB中,可以开启log_slow_verbosity参数,可以更加详尽的打印出慢SQL的执行细节,该参数在MySQL8.0版本中并未支持,读者感兴趣可以自行查阅相关信息。
Show tables 该语句用于展示当前db下所有的table 语法: SHOW TABLES; Show tablet 该语句用于显示tablet相关的信息(仅管理员使用) 语法: SHOW TABLET [FROM [db_name.]table_name | tablet_id] 举例: 1.显示指定 db 的下指定表所有 tablet 信息 SHOW TABLET FROM example_db.table_name; 2.显示指定 tablet...