WHERE Clause Operators Operator Description
= Equality
<> Nonequality
!= Nonequality
< Less than
<= Less than or equal to
> Greater than
>= Greater than or equal to BETWEEN Between two specified values
BETWEEN AND
(jlive)[crashcourse]>SELECT prod_name,prod_price FROM products WHERE prod_price BETWEEN 5 AND 10;
+----------------+------------+
| prod_name | prod_price |
+----------------+------------+
| .5 ton anvil | 5.99 |
| 1 ton anvil | 9.99 |
| Oil can | 8.99 |
| TNT (5 sticks) | 10.00 |
| Bird seed | 10.00 |
+----------------+------------+
5 rows in set (0.00 sec)
通配LIKE(_%)
(jlive)[crashcourse]>SELECT prod_name,prod_price FROM products WHERE prod_price BETWEEN 5 AND 10 AND prod_name LIKE 'Oil%';
+-----------+------------+
| prod_name | prod_price |
+-----------+------------+
| Oil can | 8.99 |
+-----------+------------+
1 row in set (0.00 sec)
(jlive)[crashcourse]>SELECT prod_id, prod_name FROM products WHERE prod_name LIKE '_ ton anvil';
+---------+-------------+
| prod_id | prod_name |
+---------+-------------+
| ANV02 | 1 ton anvil |
| ANV03 | 2 ton anvil |
+---------+-------------+
2 rows in set (0.00 sec)
(AND) OR组合
(jlive)[crashcourse]>SELECT vend_id,prod_name,prod_price FROM products WHERE vend_id = 1002 OR vend_id = 1003 AND prod_price >= 10 ORDER BY prod_price DESC;
+---------+----------------+------------+
| vend_id | prod_name | prod_price |
+---------+----------------+------------+
| 1003 | Safe | 50.00 |
| 1003 | Detonator | 13.00 |
| 1003 | TNT (5 sticks) | 10.00 |
| 1003 | Bird seed | 10.00 |
| 1002 | Oil can | 8.99 |
| 1002 | Fuses | 3.42 |
+---------+----------------+------------+
6 rows in set (0.00 sec)
(jlive)[crashcourse]>SELECT vend_id,prod_name,prod_price FROM products WHERE (vend_id = 1002 OR vend_id = 1003) AND prod_price >= 10 ORDER BY 3 DESC;
+---------+----------------+------------+
| vend_id | prod_name | prod_price |
+---------+----------------+------------+
| 1003 | Safe | 50.00 |
| 1003 | Detonator | 13.00 |
| 1003 | TNT (5 sticks) | 10.00 |
| 1003 | Bird seed | 10.00 |
+---------+----------------+------------+
4 rows in set (0.00 sec)
(NOT) IN
(jlive)[crashcourse]>SELECT vend_id,prod_name,prod_price FROM products WHERE vend_id IN (1002,1003) ORDER BY vend_id;
+---------+----------------+------------+
| vend_id | prod_name | prod_price |
+---------+----------------+------------+
| 1002 | Oil can | 8.99 |
| 1002 | Fuses | 3.42 |
| 1003 | Sling | 4.49 |
| 1003 | TNT (1 stick) | 2.50 |
| 1003 | TNT (5 sticks) | 10.00 |
| 1003 | Bird seed | 10.00 |
| 1003 | Carrots | 2.50 |
| 1003 | Safe | 50.00 |
| 1003 | Detonator | 13.00 |
+---------+----------------+------------+
9 rows in set (0.00 sec)
(jlive)[crashcourse]>SELECT vend_id,prod_name,prod_price FROM products WHERE vend_id NOT IN (1002,1003) ORDER BY vend_id;
+---------+--------------+------------+
| vend_id | prod_name | prod_price |
+---------+--------------+------------+
| 1001 | .5 ton anvil | 5.99 |
| 1001 | 1 ton anvil | 9.99 |
| 1001 | 2 ton anvil | 14.99 |
| 1005 | JetPack 1000 | 35.00 |
| 1005 | JetPack 2000 | 55.00 |
+---------+--------------+------------+
5 rows in set (0.00 sec)
IS (NOT) NULL
(jlive)[crashcourse]>SELECT cust_id,cust_email FROM customers;
+---------+---------------------+
| cust_id | cust_email |
+---------+---------------------+
| 10001 | ylee@coyote.com |
| 10002 | NULL |
| 10003 | rabbit@wascally.com |
| 10004 | sam@yosemite.com |
| 10005 | NULL |
+---------+---------------------+
5 rows in set (0.00 sec)
(jlive)[crashcourse]>SELECT cust_id,cust_email FROM customers WHERE cust_email IS NOT NULL;
+---------+---------------------+
| cust_id | cust_email |
+---------+---------------------+
| 10001 | ylee@coyote.com |
| 10003 | rabbit@wascally.com |
| 10004 | sam@yosemite.com |
+---------+---------------------+
3 rows in set (0.00 sec)
–nodejs)
_全面解析Module模式)
