Display records with conditions set using if statement in UPDATE statement with MySQL

Let us first create a table −

mysql> create table DemoTable    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20),    -> StudentMarks int,    -> Status varchar(20)    -> ); Query OK, 0 rows affected (0.97 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(StudentName,StudentMarks) values('Chris',79); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentName,StudentMarks) values('David',59); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(StudentName,StudentMarks) values('Bob',60); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(StudentName,StudentMarks) values('Mike',45); Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+-------------+--------------+--------+ | StudentId | StudentName | StudentMarks | Status | +-----------+-------------+--------------+--------+ |        1 | Chris        |           79 | NULL   | |        2 | David        |           59 | NULL   | |        3 | Bob          |           60 | NULL   | |        4 | Mike         |           45 | NULL   | +-----------+-------------+--------------+--------+ 4 rows in set (0.00 sec)

Following is the query to set conditions while updating −

mysql> update DemoTable    -> set Status=if(StudentMarks > 60 ,'PASS','FAIL'); Query OK, 4 rows affected (0.40 sec) Rows matched: 4 Changed: 4 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+-------------+--------------+--------+ | StudentId | StudentName | StudentMarks | Status | +-----------+-------------+--------------+--------+ |         1 | Chris       |           79 | PASS   | |         2 | David       |           59 | FAIL   | |         3 | Bob         |           60 | FAIL   | |          4 | Mike       |           45 | FAIL   | +-----------+-------------+--------------+--------+ 4 rows in set (0.00 sec)