%：匹配零個及多個任意字符； _：與任意單字符匹配； []：匹配一個範圍； [^]：排除一個範圍
Symbol Meaning 
like ‘5[%]‘ 5% 
like ‘[_]n‘ _n 
like ‘[a-cdf]‘ a, b, c, d, or f 
like ‘[-acdf]‘ -, a, c, d, or f 
like ‘[[]‘ [ 
like ‘]‘ ] 
like ‘abc[_]d%‘ abc_d and abc_de 
like ‘abc[def]‘ abcd, abce, and abcf 
like ‘[^1-9]‘ 0 
like ‘[^1-9b-z]‘ 0, a
對於字符串中出現的特殊字符：‘%‘，‘[‘，‘[]‘， ‘_‘ 可以使用 ‘[]‘ 把它們包含起來，這樣在匹配模式（pattern）中，它們就被當作普通字符對待了。
 

查詢
select * from (文件名) where （條件  xxx=‘xxx‘);

and :
    =
    !=
    <,>,<>
    like


select count(1) from anyun_tbl;  （查詢總條數）
+----------+
| count(1) |
+----------+
|        3 |
+----------+

select count(1) as ‘number‘ from anyun_tbl where anyun_name = ‘上海‘;
+--------+
| number |
+--------+
|      1 |
+--------+

select count(1) as ‘number‘,anyun_name from anyun_tbl where anyun_name = ‘北京‘;
+--------+------------+
| number | anyun_name |
+--------+------------+
|      1 | NULL       |
+--------+------------+


字符串拼接
select concat(‘1‘,‘2‘);
+-----------------+
| concat(‘1‘,‘2‘) |
+-----------------+
| 12              |
+-----------------+

select concat(anyun_id,‘-‘,anyun_name) from anyun_tbl;
+---------------------------------+
| concat(anyun_id,‘-‘,anyun_name) |
+---------------------------------+
| 1-shanghai                      |
| 2-beijing                       |
| 3-hubie                         |
+---------------------------------+


 

Mysql 函數