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:

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