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;...
SELECT column1, column2... FROM table_name; In the above query, we need to put the columns we want to retrieve data from the table. In case we want to fetch the data for all the columns or the data of the entire table, we can do so by the usage of the below syntax: SELECT *...
To rename a column In Object Explorer, right-click the table to which you want to add columns and chooseDesign. The table opens in Table Designer. UnderColumn Name,select the name you want to change and type a new one. The column is renamed in your table as soon as you exit the cell...
数据导入到新表中,然后将新表rename为原始表名。ok,就是这个思路,虽然导入导出很浪费时间,尤其实在包含大量数据及索 引的时候,尤其要注意。但是也没有其他更好的办法。 具体的sql语句如下(语句来源于http://grasswiki.osgeo.org/wiki/Sqlite_Drop_Column): ...
How to Rename SQL Logins in SQL Server If you want to rename a SQL Server login (SQL Server Authentication) you can use one of the following syntaxes: Syntax 1: ALTER LOGIN "[SQL Server Login Name]" WITH NAME="[New SQL Server Login Name]"; ...
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 Server does this automatically, and if you add the schema name, you’ll end up with a duplication in your name (e.g. dbo.dbo.sales instead of dbo.sales). Here’s an example. To rename the “employee” table to “person” in the dbo schema: EXEC sp_rename 'dbo.employee' '...
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Introduction to SQL Aliases Aliasing temporarily renames a table or column by assigning it a new name. Table aliases are employed to rename a table in a particular SQL statement. The databases don’t alter the table’s name; the renaming is only a temporary change. For the sake of a spec...