1. LIMIT syntax
The first:
SELECT
column1,column2,...
FROM
table
LIMIT offset , count;
The second:
SELECT
column1,column2,...
FROM
table
LIMIT count;
2. IN syntax (or NOT IN)
SELECT
column1,column2,...
FROM
table_name
WHERE
(expr|column_1) IN ('value1','value2',...);
Note: The values after IN must be separated by ",";
Operators can also be used in the WHERE clause of other statements, such as INSERT, UPDATE, DELETE, etc.
3. BETWEEN syntax (>= and <=)
格式：expr [NOT] BETWEEN begin_expr AND end_expr;
* When working with date values, for best results, CAST type conversion should be used to explicitly convert the type of the column or expression to a date type;
CAST (field name as converted type), where the type can be:
CHAR[(N)] character type
DATE date type
DATETIME date and time type
DECIMAL float型
SIGNED int
TIME time type
4. LIKE （ NOT LIKE）用法
Role: pattern matching
MySQL provides two wildcards using AND operation, "_" and percentage "%",
The percent (%) wildcard allows you to match any string of zero or more characters.
The underscore (_) wildcard can match any single character.
Note that the pattern is case-insensitive to similar operators, so the patterns of b% and B% produce the same result.
Use of escape character "ESCAPE", default is backslash "\".
eg : productCode LIKE '%\_20%';
A different escape character can be specified using the escape clause , e.g. $,
eg: productCode LIKE '%$_20%' ESCAPE '$'; %$_20% 表示匹配包含“_20”字符串的任何字符串。
5. ORDER BY 用法
格式：SELECT column1, column2,...
FROM tbl
ORDER BY column1 [ASC|DESC], column2 [ASC|DESC...
默认：ASC (升序)
**自定义排序函数FIELD()
格式：field(value,str1,str2,str3,str4)
value与str1、str2、str3、str4比较，返回1、2、3、4，如遇到null或者不在列表中的数据则返回0。