mysql select语句操作实例

Select的语法

复制代码 代码如下:

SELECT
    [ALL | DISTINCT | DISTINCTROW ]
      [HIGH_PRIORITY]
      [STRAIGHT_JOIN]
      [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT]
      [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]
    select_expr, ...
    [INTO OUTFILE 'file_name' export_options
      | INTO DUMPFILE 'file_name']
    [FROM table_references
    [WHERE where_definition]
    [GROUP BY {col_name | expr | position}
      [ASC | DESC], ... [WITH ROLLUP]]
    [HAVING where_definition]
    [ORDER BY {col_name | expr | position}
      [ASC | DESC] , ...]
    [LIMIT {[offset,] row_count | row_count OFFSET offset}]
    [PROCEDURE procedure_name(argument_list)]
    [FOR UPDATE | LOCK IN SHARE MODE]]

SELECT用于恢复从一个或多个表中选择的行，并可以加入UNION语句和子查询。

每个select_expr都指示一个您想要恢复的列， table_references指示行从哪个表或哪些表中被恢复。

简单查询

复制代码 代码如下:

SELECT columna columnb FROM mytable;

ORDER BY查询

复制代码 代码如下: