Select between two tables, two columns

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Select between two tables, two columns



I am trying to find all records in TableA which are not in TableB by comparing 2x columns in each table. I have tried all sorts of queries but I cannot figure it. Any help would be much appreciated.



TableA Has ColumnA and ColumnDate



TableB Has ColumnA and ColumnDate



So I only want to see which records in TableA do not match TableB for both columns.
Also, TableA may have several matching fields so I need to group them to have only 1 entry into TableB for each match.
Yes I want to insert the new records into TableB.
It appears harder than expected.



Something like this:


select ColumnDate, ColumnA
from TableA
where
(( ColumnDate not in (select ColumnDate from TableB) )
and ( ColumnA not in (select ColumnA from TableB) ))
group by ColumnA, ColumnDate;





See meta.stackoverflow.com/questions/333952/…
– Strawberry
Aug 6 at 6:56





Thank you Strawberry. I have searched for an answer, explained what I'm looking for, what the expected output is and left a sqlfiddle. What else should I be doing to get some help?
– Jamie T
Aug 8 at 3:37





How come lukass gets a fiddle, but we don't? Edit your question in line with the accepted answer at the linked question- or don't
– Strawberry
Aug 8 at 6:47






Here is a SQLFIDDLE. Example, ColumnA has multiple entries for '1027'. But the reults should only show 2x results for 1027 because 1027 is already in TableB for the other dates. Should only show 11 & 12th Feb for 1027: sqlfiddle.com/#!9/d70c9a – Jamie T 2 days ago
– Jamie T
Aug 9 at 2:07




1 Answer
1



There are two approaches to this, If I want to just sync two tables I use straight INSERT SELECT.


INSERT SELECT


INSERT INTO TableB (ColumnA, ColumnDate)
SELECT FROM TableA (ColumnA, ColumnDate)
ON DUPLICATE KEY UPDATE ColumnDate = ColumnDate



But be careful, you need to have Primary Key or Unique index on TableB, so the engine will only insert new rows based on uniqueness/pk of the receiving table.





Thanks Lukas. This isn't quite what I am loking for. TableA will have multiples of the same ColumnA and ColumnDate which are identical. I want to group the (into 1 record per match, and insert into TableB if there is no match in TableB.
– Jamie T
Aug 6 at 5:50






Here is a SQLFIDDLE. Example, ColumnA has multiple entries for '1027'. But the reults should only show 2x results for 1027 because 1027 is already in TableB for the other dates. Should only show 11 & 12th Feb for 1027: sqlfiddle.com/#!9/d70c9a
– Jamie T
Aug 6 at 6:41







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