SELECT 基本语法结构

                                                                          SELECT 基本语法结构

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]]