[英]Combine two MySql into one query
我有兩個SQL查詢,我需要將它們合並為一個查詢以提高效率,只是不確定如何做到。 基本上,我需要查詢我的供應商,然后對每個供應商進行檢查,以查看清單表是否具有多個基於“供應商ID”匹配的記錄,如果有,那么我需要返回供應商名稱和ID。 這是我的兩個查詢:
查詢1:
SELECT s.name, s.id
FROM Supplier s
查詢2:
SELECT l.asin,
l.id,
COUNT(*) c
FROM Listing l
LEFT JOIN Product p
ON p.id = l.product_id
LEFT JOIN Supplier s
ON p.supplier_id = s.id
WHERE (l.matchValidated IS NULL OR l.matchValidated = 0)
AND s.id = SUPPLIER_ID_GOES_HERE
GROUP BY l.asin HAVING c > 1);
您已經在第二個查詢中加入了供應商,因此只需將供應商名稱和ID添加到SELECT
和GROUP BY
。
SELECT l.asin,
l.id,
s.name AS supplier_name,
s.id AS supplier_id,
COUNT(*) c
FROM Listing l
LEFT JOIN Product p
ON p.id = l.product_id
LEFT JOIN Supplier s
ON p.supplier_id = s.id
WHERE (l.matchValidated IS NULL OR l.matchValidated = 0)
GROUP BY l.asin, l.id, s.name, s.id
HAVING c > 1;
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