1、增加
（1）插入记录：
INSERT [INTO] tbl_name[( col_name )] {VALUES | VALUE}({expr | DEFAULT},...),(...),...
（2）可以使用子查询（SubQeury）:
INSERT [INTO] tbl_name SET col_name={expr | DEFAULT},...
（3）将查询结果插入到指定数据表：
INSERT [INTO] tbl_name[(col_nmae,...)] SELECT ...
2、删除
DELETE FROM tbl_name [WHERE where_condition]
3、更新
UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET col_name1={expr1 | DEFAULT }[, col_name1={expr1 | DEFAULT }]...[WHERE where_condition]
4、查询
SELECT select_expr [,select_expr]
[
FROM table_references
[ WHERE where_condition ]//条件表达式，支持函数或运算符
[ GROUP BY {col_name | position} [ASC | DESC], ... ] //查询结果分组
[ HAVING where _condition ]//分组条件
[ ORDER BY {col_name | expr | position} [ASC | DESC ], ... ]//查询结果排序
[ LIMIT {[offset,] row_count | row_count OFFSET offset} ] //限制查询结果返回的数量
]
*表示所有列
AS 赋予别名
写操作：INSERT UPDATE DELETE
读操作：SELECT
