SQL update with where

Update with condition

WHERE clause can be used with SQL UPDATE to add conditions while modifying records.

Without using any WHERE clause, the SQL UPDATE command can change all the records for the specific columns of the table.

Example:

Sample table: customer1

To change the value of 'phone_no' of 'customer1' table with 'PHONE NO' with the following condition -

1. 'cust_city' must be 'Torento',

the following SQL statement can be used:

UPDATE customer1 
SET phone_no='PHONE NO' 
WHERE cust_city='Torento';

SQL update multiple columns

In the following, we are going to discuss how to change the data of more than one columns with the SQL UPDATE statement.

Example:

Sample table: customer1

To change the value of 'phone_no' column with 'Phone No' and 'cust_city' with 'Kolkata' and 'grade' with 1 of 'customer1' table with the following condition -

1. 'agent_code' must be 'A002',

the following SQL statement can be used :

UPDATE customer1
SET phone_no='Phone No',cust_city='Kolkata',grade=1
WHERE agent_code='A002';

SQL update multiple columns with boolean 'AND'

In the following, we are going to discuss how to change the data of one or more columns with the SQL UPDATE statement along with one or more condition which can be joined by BOOLEAN AND operator.

Example:

Sample table: customer1

To change the value of 'phone_no' column with 'Phone No' and 'cust_city' with 'Kolkata' and 'grade' with 1 of 'customer1' table with following conditions -

1. 'agent_code' must be 'A002',

2. and 'cust_country' must be 'India',

the following SQL statement can be used :

UPDATE customer1
SET phone_no='Phone No',cust_city='Kolkata',grade=1
WHERE agent_code='A002'
AND cust_country='India';

Output:

See our Model Database

Here is a new document which is a collection of questions with short and simple answers, useful for learning SQL as well as for interviews.

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