RESTRICT(default): refuses to truncate if any of the tables have foreign-key references from tables that are not listed in the command. partition_name Indicates the partition in the target partition table. Value
AI代码解释 SQL>alter table tbl_b disable constraintFK_TBL_B_A;Table altered.SQL>select constraint_name,constraint_type,status from user_constraints where table_name='TBL_B';CONSTRAINT_NAMECSTATUS---PK_TBL_BPENABLEDFK_TBL_B_ARDISABLED STATUS状态变为DISABLED了。 truncate表: 代码语言:javascript ...
SQL> insert into tbl_a values(1, 'a'); 1 row created. SQL> commit; Commit complete. SQL> truncate table tbl_a; truncate table tbl_a * ERROR at line 1: ORA-02266: unique/primary keys in table referenced by enabled foreign keys 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 此时...
The CREATE TABLE command creates a new table in the database.The following SQL creates a table called "Persons" that contains five columns: PersonID, LastName, FirstName, Address, and City:ExampleGet your own SQL Server CREATE TABLE Persons ( PersonID int, LastName varchar(255), FirstName...
DROP TABLE command deletes a table in the database. The following SQL deletes the table "Shippers":ExampleGet your own SQL Server DROP TABLE Shippers; Note: Be careful before deleting a table. Deleting a table results in loss of all information stored in the table!
Executed in 0 seconds SQL> select count(*) from mytest; --表已经空了,但没有想象中快速完成查询,用时57秒,这不大正常,但证明HWM确实没有下去,在执行不必要的空块读取 COUNT(*) --- 0 Executed in 57.046 seconds SQL> truncate table mytest; --TUNCATE重置HWM,扫描数据块大大降低,很快过去 Table...
TRUNCATE statement: This command is used to delete all the rows from the table and free the space containing the table.SQL DROP Statement:The SQL DROP command is used to remove an object from the database. If you drop a table, all the rows in the table is deleted and the table ...
--回滚之后再次检查TruncateTableSELECT*FROMTruncateTabelGO F5执行,如图: 参考:http://blog.sqlauthority.com/2010/03/04/sql-server-rollback-truncate-command-in-transaction/ --EOF-- Author:兴百放 Web:http://xbf321.cnblogs.com/ Time:2010.3.12...
Next, we can verify this with this SQL query: SELECT * FROM Department; We can see the output of the executed SQL query: As seen above, all the records were deleted and the table still exists. 3. What Is aDELETEStatement In contrast to theTRUNCATEstatement,theDELETEstatement in SQL is ...
You should consider about using Truncate table statement in your Pl/SQL code. Truncate table have better performance but you cannot rollback data after truncate. Truncate table can be executed in combination with EXECUTE IMMEDIATE command in Pl/SQL code. ...