Here you will learn how to modify or delete indexes in SQL Server. Modify Index To add, remove, or change the position of an index column, you must drop and recreate the index. However, you can set several options on the index using ALTER INDEX statement. The following query modifies the...
If you want to run these queries outside of Performance Data Investigator, the aliases will need to be recreated in your own interactive session. Once the SQL statement has been modified and the perspective has been displayed again, you can then use the "Save As" action to save the updated...
Constraints ensure data integrity. You can use theALTER TABLEstatement to add constraints like primary keys, foreign keys, and unique constraints. For example, let’s add a unique constraint to the “Email” column in the “Customers” table. ALTER TABLE Customers ADD CONSTRAINT UQ_Email UNIQUE ...
Here you will learn how to modify and delete triggers in SQL Server. The ALTER TRIGGER statement is used to modify the definition of an existing trigger without altering the permissions or dependencies. Syntax: Copy ALTER TRIGGER trigger_name ON { Table name or view name } [ WITH <Options>...
SQL Mode Transactions Garbage Collection (GC) System Tables UI FAQs Release Notes Glossary Important You are viewing the archived documentation of TiDB, which no longer receives updates. It is recommended that you usethe latest LTS versionof the TiDB database. ...
Alter Table Modify SQL Example This sample illustrates use of ALTER TABLE statement with MODIFY option. This SQL script contains eight queries. First one deletes table named "MyTable". The second creates this table with 2 fields. Queries 3 - 6 insert some data into the table....
To alter the stored procedure, right click it and select Modify that brings the stored procedure in new query window with ALTER statement. Now, alter the stored procedure (altering means addition / deletion / modifying the parameters and its type, altering the SQL statements etc.) and press Ex...
SQL - ALTER TABLE statement: Here, we will learn how to modify a table’s definition like adding columns, removing columns, changing the data type size etc. Submitted byShubham Singh Rajawat, on November 14, 2017 ALTER TABLE statement is used to modify the definition/structure of the table....
Transact-SQL stored procedures cannot be modified to be CLR stored procedures and vice versa. If the previous procedure definition was created using WITH ENCRYPTION or WITH RECOMPILE, these options are enabled only if they are included in the ALTER PROCEDURE statement. Permissions ...
“NULL columns require additional space in the row to record whether their values are NULL. For MyISAM tables, each NULL column takes one bit extra, rounded up to the nearest byte.” 12. Prepared Statements Prepared Statements很像存储过程,是一种运行在后台的SQL语句集合,我们可以从使用 prepared ...