To remove a constraint, use theDROP CONSTRAINTclause in theALTER TABLEstatement. If you wish to drop the unique constraint on the “Email” column: ALTER TABLE Customers DROP CONSTRAINT UQ_Email; 4. Renaming Tables TheALTERcommand allows you to rename a table easily. Suppose you want to ren...
How to Use RENAME COLUMN Command to Rename Columns in PostgreSQL? The“RENAME COLUMN”command can also be used as“RENAME”. TheRENAME COLUMNcommand gets executed with the assistance ofALTER TABLEcommand, as shown in the following syntax: ALTERTABLEtab_nameRENAMECOLUMNold_col_nameTOnew_col_name;...
SQL Copy Here we get the constraints name that we have created. Now we are able to drop the constraints by using the above name. alter table STUDENT_DETAILS drop constraint DF__STUDENT_D__IS_RE__3846C6FF SQL Copy Now we are able to drop the column by using the below query. alter ...
http://www.techonthenet.com/sql/tables/alter_table.php Thanks&Regards, Arunabathan.G Thursday, February 23, 2012 6:12 AM sp_RENAME 'TableName.[OldColName]' , '[NewColName]', 'COLUMN' Thursday, February 23, 2012 6:15 AM use this to rename column of table ...
SQL UNION – Syntax, Examples, and Use Cases SQL Functions: What is It and Exploring Its Various Types How to Run Function in SQL? Replace in SQL: Usage and Implementation of REPLACE() Function ALTER TABLE Statement in SQL – ADD, DROP, MODIFY, RENAME ...
ALTER command can be used to add columns to an existing table, drop a column from a table, rename an existing column, and change the data type of a column. Below are the syntax used for the different operations which can be performed using Alter command. ...
PostgreSQL throws an error if you try to rename the non-existing table. In order to avoid this situation, you need to add the IF EXISTS parameter as follows: Code: ALTER TABLE IF EXISTS table_name RENAME TO new_table_name; In order to rename multiple tables at a time, you need to ex...
Summary: in this tutorial, you will learn how to rename tables using MySQL RENAME TABLE statement and ALTER TABLE statement. Introduction to MySQL RENAME TABLE statement# Because business requirements change, we need to rename the current table to a new one to better reflect the new situation. ...
In SQL Server, you can use IDENTITY to define a column with auto increment values. It auto generates a new unique number when inserting a new record into the table.
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