There is a command ALTER TABLE ... ADD CONSTRAINT ..., but I cannot find a reverse command How to solve it?Navigate: Previous Message• Next Message Options: Reply• Quote Subject Views Written By Posted How to drop unique constraint 6995 Peter Melvyn May 05, 2008 03:26AM Re: ...
Query to execute the DROP constraint in MySQL: AltertablestudentPKdropprimarykey; The above syntax changes the syntax ofstudentPkusing theAlterkeyword. Since the constraint is at table level, it is easy to drop at table level well. TheAltercommand is the best fit while changing the table’s...
Handling foreign key constraints in MySQL The simplest way to solve this problem is to delete the foreign key from the child table. This will delete the relationship between the two tables. Follow these steps to handle the foreign key constraints. Syntax ALTER TABLE tbl_name DROP FOREIGN KEY ...
(or record file crashed) MySQL error code 135 = No more room in record file MySQL error code 136 = No more room in index file MySQL error code 141 = Duplicate unique key or constraint on write or update MySQL error code 144 = Table is crashed and last repair failed MySQL error code ...
MySQL enables you to work both with transactional tables that permit rollback and with nontransactional tables that do not. Because of this, constraint handling is a bit different in MySQL than in other DBMSs. We must handle the case when you have inserted or updated a lot of rows in a ...
MySQL UNIQUE INDEX Introduction to MySQL UNIQUE INDEX UNIQUE INDEX constraints are used in MySQL to maintain the uniqueness of values in the database. MySQL has the ‘PRIMARY KEY’ constraint to define unique columns in a table. But it can specify only one column per table. So, when ...
In MySQL, you can add constraints to existing tables as well as delete them withALTER TABLEstatements. For example, the following command adds aUNIQUEconstraint to theempNamecolumn in theemployeeInfotable created previously: ALTER TABLE employeeInfo ADD UNIQUE(empName); ...
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Not able to drop Unique Non Clustered Index Not able to insert special character like 'ł', 'ş' in SQL SERVER. NOT Exists with Select 1 - Confusing!!! NOT IN filter in SQL behaviour based on data type Not IN with multiple columns NULL recognized as int? Null value in bit field....
How to drop unique constraint 28828 Sultana Jahan Rini February 17, 2006 10:33PM Re: How to drop unique constraint 48151 Roland Bouman February 18, 2006 01:25PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective ...