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Question : Adding a Count() to a Union Query
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Hi Folks,
I have an existing query that utilizes a UNION ALL to 'merge' 2 similar tables (allowing output by Date). I have a 3rd table, 'comments', that contains data related to the previous 2 tables.
In simple terms, if you imagine this is for a blog, and there are 2 different types of entry (the 2 tables previously mentioned) and a combined comments table - that is effectively the setup.
I want to incorporate a comment count into the output (but not the comments themselves). Is this possible? The comments table contains the following fields;
ID, mid, c_name, c_email, c_comment & artid
artid is either the CodeID or DealID in the previously mentioned 2 tables.
My existing query is given below.
Code Snippet:
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SELECT 'CODE' AS TypeName, addeddate AS AddDate, thecode, mid, discount, discounttype, minspend, expiry_date, notes, percentproduct, fixedproduct, NULL AS deal_detail, NULL AS deal_title, ID AS CodeID, NULL AS DealID
FROM discountcodes
WHERE mid='50'
UNION ALL
SELECT 'DEAL' AS TypeName, dateadded AS AddDate, NULL AS thecode, mid, NULL AS discount, NULL AS discounttype, NULL AS minspend, NULL AS expiry_date, NULL AS notes, NULL AS percentproduct, NULL AS fixedproduct, deal_detail, deal_title, NULL AS CodeID, ID AS DealID
FROM hotdeals
WHERE mid='50'
ORDER BY AddDate
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Answer : Adding a Count() to a Union Query
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ups... missed some brackets
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SELECT 'CODE' AS TypeName, addeddate AS AddDate, thecode, mid, discount, discounttype, minspend, expiry_date,
notes, percentproduct, fixedproduct, NULL AS deal_detail, NULL AS deal_title, ID AS CodeID, NULL AS DealID,
(SELECT(COUNT(artid) FROM comment WHERE artid=ID) as COMMENTS
FROM discountcodes
WHERE mid='50'
UNION ALL
SELECT 'DEAL' AS TypeName, dateadded AS AddDate, NULL AS thecode, mid, NULL AS discount, NULL AS discounttype,
NULL AS minspend, NULL AS expiry_date, NULL AS notes, NULL AS percentproduct, NULL AS fixedproduct, deal_detail,
deal_title, NULL AS CodeID, ID AS DealID,
(SELECT(COUNT(artid) FROM comment WHERE artid=ID) as COMMENTS
FROM hotdeals
WHERE mid='50'
ORDER BY AddDate
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