mysql查询某个数据库某个表的字段

1、查看字段详细信息

-- 查看详细信息


SELECT
  COLUMN_NAME "字段名称",
  COLUMN_TYPE "字段类型长度",
  IF(EXTRA="auto_increment",CONCAT(COLUMN_KEY,"(", IF(EXTRA="auto_increment","自增长",EXTRA),")"),COLUMN_KEY) "主外键",
  IS_NULLABLE "空标识",
  COLUMN_COMMENT "字段说明"
FROM
    information_schema. COLUMNS

-- 数据库名：jn_power 表名 rpt_cap_hour_ammeter_201810

WHERE TABLE_SCHEMA = 'jn_power' AND TABLE_NAME = 'rpt_cap_hour_ammeter_201810';

结果如下： 

2、查字段

SELECT
    CONCAT(COLUMN_NAME,"," )
  
FROM
    information_schema.COLUMNS
WHERE
    TABLE_SCHEMA = 'jn_power'
AND TABLE_NAME = 'rpt_cap_ammeter_2018';