mysql怎样查询表的信息！
SHOW COLUMNS FROM 数据表：显示数据表的属性，属性类型，主键信息，是否为NULL，默认值等其他信息。12345678910mysql> SHOW COLUMNS FROM runoob_tbl;+-----------------+--------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+-----------------+--------------+------+-----+---------+-------+| runoob_id | int(11) | NO | PRI | NULL | || runoob_title | varchar(255) | YES| | NULL | || runoob_author | varchar(255) | YES| | NULL | || submission_date | date | YES| | NULL | |+-----------------+--------------+------+-----+---------+-------+4 rows in set (0.01 sec) SHOW INDEX FROM 数据表：显示数据表的详细索引信息，包括PRIMARY KEY（主键）。
1234567mysql> SHOW INDEX FROM runoob_tbl;+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+| runoob_tbl | 0 | PRIMARY| 1 | runoob_id | A | 2 | NULL | NULL | | BTREE | | |+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+1 row in set (0.00 sec) SHOW TABLE STATUS LIKE \G：该命令输出MySQL数据库管理系统的性能以及统计信息。
1234mysql> SHOW TABLE STATUSFROM RUNOOB; # 显示数据库 RUNOOB 中所有表的信息 mysql> SHOW TABLE STATUS from RUNOOB LIKE 'runoob%'; # 表名以runoob开头的表的信息mysql> SHOW TABLE STATUS from RUNOOB LIKE 'runoob%'\G; # 加上 \G，查询结果按列打印
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