टेबल_नाम और कॉलम नाम प्राप्त करने के लिए आप इसका उपयोग कर सकते हैं:
SELECT
CONCAT(`table_name`, '-',
GROUP_CONCAT(`column_name` ORDER BY ordinal_position SEPARATOR ':')) AS result
FROM information_schema.columns
-- WHERE `table_name` = ?
GROUP BY `table_name`;
आउटपुट:
╔══════════════╗
║ result ║
╠══════════════╣
║ tab0-id:col ║
║ tab1-id:col2 ║
║ tab2-id:col3 ║
╚══════════════╝
प्रत्येक कॉलम के लिए नमूना रिकॉर्ड प्राप्त करने के लिए आपको डायनामिक-एसक्यूएल का उपयोग करना होगा:
SET @sql = '';
SELECT @sql := CONCAT(@sql,
'(SELECT ''', `table_name`, ''' AS tab_name, ''',
`column_name`, ''' AS column_name, ',
`ordinal_position`, ' AS ordinal_pos, ',
`column_name`, ' AS sample '
'FROM ', `table_name` ,
' LIMIT 1) UNION ALL ')
FROM information_schema.columns
WHERE `table_name` LIKE 'tab_';
SET @sql := SUBSTRING(@sql, 1, LENGTH(@sql) - 11);
SET @final_sql =
'SELECT CONCAT(`tab_name`, ''-'',
GROUP_CONCAT(CONCAT(`column_name`, '':'', sample ) ORDER BY ordinal_pos))
AS result
FROM ( <placeholder> ) AS sub
GROUP BY tab_name';
SET @final_sql = REPLACE(@final_sql, '<placeholder>', @sql);
prepare s from @final_sql;
execute s;
deallocate prepare s;
आउटपुट:
╔════════════════════════════╗
║ result ║
╠════════════════════════════╣
║ tab0-id:1,col:a ║
║ tab1-id:10,col2:2 ║
║ tab2-id:20,col3:2016-01-26 ║
╚════════════════════════════╝