MySQL evaluates a true expression to 1 and a false expression to 0 : Boolean « Data Type « SQL / MySQL

1. SQL / MySQL
2. Data Type
3. Boolean

MySQL evaluates a true expression to 1 and a false expression to 0

      
mysql>
mysql>
mysql> CREATE TABLE sales_rep(
    ->   employee_number INT,
    ->   surname VARCHAR(40),
    ->   first_name VARCHAR(30),
    ->   commission TINYINT,
    ->   date_joined date,
    ->   birthday date
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO sales_rep values(1,'James','Writer',10, '1989-01-01', '1969-02-02');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT YEAR(NOW()) > YEAR(birthday) FROM  sales_rep WHERE employee_number=1;
+------------------------------+
| YEAR(NOW()) > YEAR(birthday) |
+------------------------------+
|                            1 |
+------------------------------+
1 row in set (0.00 sec)

mysql> SELECT YEAR(NOW()) < YEAR(birthday) FROM  sales_rep WHERE employee_number=1;
+------------------------------+
| YEAR(NOW()) < YEAR(birthday) |
+------------------------------+
|                            0 |
+------------------------------+
1 row in set (0.00 sec)

mysql>
mysql>
mysql> drop table sales_rep;
Query OK, 0 rows affected (0.00 sec)

   
    
    
    
    
    
  

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