CONSTRAINT [ IF EXISTS ] name 删除由名称标识的主键、外键或 CHECK 约束。 CHECK 约束只能按名称删除。 RESTRICT 或CASCADE 如果指定 RESTRICT 并且主键由任何外键引用,则语句将失败。如果指定 CASCADE,则删除主键会导致删除任何引用该表的外键。默认为 RESTRICT。 IF EXISTS 如果指定 IF ...
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How to delete data that not exists in another table? How to delete duplicate rows from temp table? How to delete last 6 months data using storedprocedure where table does'nt contains timestamp field How to delete or drop a cursor? How to delete Row from table which has FK Constraint on...
Jira Link: DB-3946 Description In tpcc, we have a method enableForeignKeys, which creates FKs after data is loaded. In this method, drop constraint with 'if exists' is giving ERROR, causing this statement to fail, and as a result other a...
PostgreSQL migrations for DROP CONSTRAINT should include IF EXISTS This sounds minor, but would make migrations a lot less fragile when reverting / dealing with merge conflicts. Hopefully this is a simple change too 🙂 Current ALTER TABLE...
If it is T-SQL, checks are done like this IF EXISTS (SELECT 1 from sys.objects where name = 'CUSTOMER_RICH_CONTACTS_RO1') ALTER TABLE MCCOYS.CUSTOMER_RICH_CONTACTS DROP CONSTRAINT CUSTOMER_RICH_CONTACTS_RO1 Gail Shaw Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci) ...
drop: 删除 procedure :存储过程 if exists :判断是否存在 scema_changhe 存储过程名称; 判断这个名称的存储过程是否存在,存在就删除,然后再创建了这个存储过程,执行完之后又将它删除了(个人觉得你这段是有问题的delimiter ';;';)
ALTER TABLE DROP COLUMN IF EXISTS ALTER TABLE DROP CONSTRAINT IF EXISTSDocumentation is already published on MSDN:DROP TABLE (Transact-SQL),DROP PROCEDURE (Transact-SQL), DROP TRIGGER (Transact-SQL), ALTER TABLE (Transact-SQL), etc.CommentsAnonymous November 02, 2015 Finally! I can...
1、当表设置了FOREIGN KEY 约束条件时,在INSERT INTO 数据时会报错“Mysql错误1452 - Cannot add or update a child row: a foreign key constraint fails”; 解决方法:删除外键约束 ALTER TABLE <表名> DROP FOREIGN KEY <外键约束名> 2、当表设置了PRIMARY KEY约束条件时,必须要设置auto_increment特性,否则...
Using IF EXISTS & NOT EXISTS DROP Primary Key Constraint Forum – Learn more on SQLServerCentral