如何在mysql中检查多个表

Question

I'm doing a search my database called 'songs' and it got an average of 60 tables, all columns have the same name (id, name, data).

SELECT * FROM (all tables in my DB songs) WHERE name LIKE 'a%';

How do I get the records that meet the condition "where" of all the tables?

Answer 1

You can use UNION

  SELECT * FROM table1 WHERE name LIKE 'a%' 
  UNION 
  SELECT * FROM table2 WHERE name LIKE 'a%' ;

And on...

The question here is why do you have 60 same tables?

Answer 2

Though UNION should be what you should go for but you can also do like below (an example)

select * from sample1,sample3,sample4 
where sample1.name like 'M%'
and sample3.name like 'M%'
and sample4.name like 'M%'

Moreover, if all 60 tables have same columns (as you mentioned) then what is the point in maintaining those many table? Why not a single table?

Answer 3

To get all tables with columns 'id' or 'name' or 'data' in the database 'songs'

SELECT DISTINCT TABLE_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME
IN (
'id',  'name', 'data'
)
AND TABLE_SCHEMA =  'songs'

I can not think why there are 60 tables ?