SQL UPDATE Statement

The SQL UPDATE statement is used to update or modify a record that already exists in a table.We can use WHERE clause with the update statement.

UPDATE Statement Syntax :

The syntax of the UPDATE statement is −

UPDATE table_name
SET column1 = value1, column2 = value2...., columnN = valueN
WHERE [condition];
   

In this, the value of column 1 will be modify to value 1, column 2 to value 2 and similar columnsN to valueN.



UPDATE Statement Example :

Consider the Customer table with the following records -

CustomerID CustomerName Age Address CustomerSalary
1 Aarav 28 Udaipur 28000
2 Vivaan 25 Mumbai 30000
3 Reyansh 28 Chennai 35000
4 Muhammad 24 Udaipur 50000
5 Sai 30 Mumbai 27000


TEST CASE 1 :- The following code is an example, which would modify the CustomerName and Address fields from Customer table where CustomerID = 4.

UPDATE Customer
SET CustomerName = 'Aadesh', Address= 'Mysore'
WHERE CustomerID = 4;
   


The result for the respective sql query is as follows −

CustomerID CustomerName Age Address CustomerSalary
1 Aarav 28 Udaipur 28000
2 Vivaan 25 Mumbai 30000
3 Reyansh 28 Chennai 35000
4 Aadesh 24 Mysore 50000
5 Sai 30 Mumbai 27000



TEST CASE 2:- The following code is an example, which would modify the CustomerName fields from Customer table where Address='Mumbai'

UPDATE Customer
SET CustomerName='Gaurav'
WHERE Address='Mumbai';
   


The result for the respective sql query is as follows −

CustomerID CustomerName Age Address CustomerSalary
1 Aarav 28 Udaipur 28000
2 Gaurav 25 Mumbai 30000
3 Reyansh 28 Chennai 35000
4 Muhammad 24 Udaipur 50000
5 Gaurav 30 Mumbai 27000





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