mysql按字母顺序获取表列名

Question

Is it possible to query a MySQL database to get the column names of a table in alphabetical order? I know that

SHOW COLUMNS `table_name`;

or

DESCRIBE `table_name`;

will give me a list of the columns in a table (along with other info), but is it possible to alter the query in order to get the columns sorted alphabetically. Adding ORDER BY 'Field' didn't work, it gave a syntax error.

Answer 1

The ANSI INFORMATION_SCHEMA tables (in this case, INFORMATION_SCHEMA.COLUMNS) provide more flexibility in MySQL:

SELECT c.column_name
  FROM INFORMATION_SCHEMA.COLUMNS c
 WHERE c.table_name = 'tbl_name'
-- AND c.table_schema = 'db_name'    
ORDER BY c.column_name

Answer 2

Every field was listed twice until I used group by column name

 select c.COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS c 
 where c.TABLE_NAME = `'tbl_name'` 
 group by c.column_name 
 order by c.column_name

Answer 3

If you want more details, below query is really handy:

   SELECT COLUMN_NAME  as 'Field',
   COLUMN_TYPE    as 'Type',
   IS_NULLABLE    as 'Null',
   COLUMN_KEY     as 'Key',
   COLUMN_DEFAULT as 'Default',
   EXTRA          as 'Extra'
   from INFORMATION_SCHEMA.COLUMNS
   where TABLE_NAME   = 'my table' and
   TABLE_SCHEMA = 'my database'
   add ordering
   order by Type;  --