MySQL 获取表注释和列注释

-- 获取表注释和列注释 传入表名即可

SELECT DISTINCT
 table_name "表名",
 table_comment "表描述信息",
 column_name "列名",
 COLUMN_COMMENT "列注释"
from
(
SELECT
  t1.table_name,
  b.table_comment,
  t1.only_colname,
  t1.column_name,
  t1.COLUMN_COMMENT,
  CONCAT( colname, ' ', data_type, ' ', COMMENT_zh, ' ', splitCharacter ) str_sql
FROM
(
    SELECT
      table_name,
      column_name,
      COLUMN_COMMENT,
      concat( '"', column_name, '"' ) only_colname,
      concat( '`', column_name, '`' ) colname,
     CASE
        WHEN NUMERIC_PRECISION IS NOT NULL 
        AND ( data_type = 'decimal' OR data_type = 'numeric' ) THEN
          concat( 'decimal(', NUMERIC_PRECISION, ',', NUMERIC_SCALE, ')' ) 
          WHEN ( CHARACTER_MAXIMUM_LENGTH IS NOT NULL OR data_type = 'uniqueidentifier' ) 
          AND data_type NOT LIKE '%text%' THEN
            'string' 
            WHEN data_type IN ( 'datetime', 'date', 'timestamp', 'text', 'longtext' ) THEN
            'string' 
            WHEN data_type = 'money' THEN
            'decimal(50,4)' 
            WHEN data_type IN ( 'tinyint', 'int' ) THEN
            'bigint' ELSE data_type 
          END AS data_type,
      concat( 'comment', '  \'', COLUMN_COMMENT, '\'' ) AS COMMENT_zh,
          ',' AS splitCharacter 
        FROM information_schema.COLUMNS
          
  ) t1 JOIN information_schema.TABLES b ON t1.table_name = b.TABLE_NAME WHERE t1.table_name in ( '表一','表2')
) tt1 -- where only_colname like '%字段名%'
;