SQL update statement
Update statement
Once there is some data in the table, it may be required to modify the data. To do so, the SQL UPDATE command can be used. It changes the records in tables.
The SQL UPDATE command changes the data which already exists in the table. Usually, it is needed to make a conditional UPDATE in order to specify which row(s) are going to be updated.
The WHERE clause is used to make the update restricted and the updating can happen only on the specified rows.
Without using any WHERE clause (or without making any restriction) the SQL UPDATE command can change all the records for the specific columns of a table.
Syntax:
UPDATE < table name > SET<column1>=<value1>,<column2>=<value2>,..... WHERE <condition>;
Parameters:
| Name | Description |
|---|---|
| table_name | Name of the table to be updated. |
| column1,column2 | Name of the columns of the table. |
| value1,value2 | New values. |
| condition | Condition(s) using various functions and operators. |
Syntax diagram - UPDATE STATEMENT
SQL update for a specific column
Data for a specific column(s) can be changed with the SQL UPDATE statement.
Example:
Sample table: neworder
To change the value of 'ord_description' of 'neworder' table with 'ZOD', the following SQL statement can be used :
SQL Code:
UPDATE neworder
SET ord_description='ZOD';
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Practice SQL Exercises
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SQL: Tips of the Day
SQL Server SELECT into existing table.
INSERT INTO dbo.TABLETWO SELECT col1, col2 FROM dbo.TABLEONE WHERE col3 LIKE @search_key
This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:
INSERT INTO dbo.TABLETWO (col1, col2) SELECT col1, col2 FROM dbo.TABLEONE WHERE col3 LIKE @search_key
Database: SQL Server
Ref: https://bit.ly/3y6tpA3
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