使用条款在第二张表中插入

Question

'Routes' table includes same route upto 6 times, only want to keep record with latest 'File date' & copy these into 'Routes2' table

Heidi SQL

TRUNCATE TABLE temp.Routes2 
INSERT INTO temp.Routes2 
SELECT * 
from temp.Routes 
where temp.`File Date` = select max(t2.`File Date`) from temp.Routes as t2
LIMIT 100

get SQL error 1064

Sure, I just miss understood the syntax

Many Thanks Simon

Answer 1

You want parenthesis & reference from outerquery to make it correlated subquery :

SELECT t.*
FROM temp.Routes as t1
WHERE temp.`File Date` = (select max(t2.`File Date`) 
                          from temp.Routes as t2
                          where t1.col = t2.col
                         );

Answer 2

Try below -

    INSERT INTO temp.Routes2 
    SELECT * 
    from temp.Routes a
    where a.`File Date` = (select max(t2.`File Date`) from temp.Routes as t2)
    order by temp.`File Date` limit 100