插入记录：
INSERT [INTO] table_name (column_name,...) VALUES(); 可以插入多条记录
INSERT table_name SET column_name = 只能插入一条记录
INSERT table_name SELECT column_name FROM table_name [LIMIT]; 插入另一张表中的数据
更新记录
UPDATE table_name SET column_name = {exp|default},... [WHERE where_condition]
删除记录
DELETE FROM table_name WHERE where_condition
SELECT语句
SELECT {expr} e.g. SELECT 3+5;
SELECT column_name1,column_name2,... FROM table_name 显示顺序与SELECT语句输入顺序有关
SELECT column_name AS alias_name 起别名（AS可省略 但不推荐）
分组查询
SELECT column_name FROM table_name GROUP BY column_name [ASC|DESC];
分组的条件 HAVING 分组过滤条件：HAVING 后的字段必须是SELECT后出现过的 或为聚合函数 COUNT：计算行的数量， MAX：计算列的最大值， MIN：计算列的最小值， SUM：获取单个列的合计值， AVG：计算某个列的平均值等）中 排序操作 ORDER BY column_name [ASC|DESC],column_name [ASC|DESC]; 限制查找数量 LIMIT {[offset,] row_count | row_count OFFSET offset}] php分页技术会用到 SELECT 常用总结 SELECT {select_expr [,select_expr,...] { FROM table_name [WHERE where_condition] [GROUP BY {col_name | position} [ASC | DESC],...] [HAVING condition] [ORDER BY column_name [ASC | DESC] [LIMIT {[offset,] row_count | [row_count OFFSET offset]} }