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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

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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CASE statement in a JOIN condition?

SELECT  * 
FROM    sys.indexes i 
    JOIN sys.partitions p 
        ON i.index_id = p.index_id  
    JOIN sys.allocation_units a 
        ON CASE 
           WHEN a.type IN (1, 3) AND a.container_id = p.hobt_id THEN 1
           WHEN a.type IN (2) AND a.container_id = p.partition_id THEN 1
           ELSE 0
           END = 1

Ref: https://bit.ly/3KxZyUq