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我有兩個表稱爲A,B。我寫的SQL查詢從A檢索數據,B.它如下:SQL SELECT查詢兩行合併
SELECT A.No ,
A.ItemCode,
case when B.Year = 1 then SUM(B.Sale_Amount) end as "1Year",
case when B.Year = 2 then SUM(B.Sale_Amount) end as "2Year",
case when B.Year = 3 then SUM(B.Sale_Amount) end as "3Year"
FROM A
LEFT OUTER JOIN B ON B.ID = A.CODE
GROUP BY
A."No",
A."ItemCode",
B."Year"
這給了下面的輸出:
但我需要這三行兩行選擇如下:
刪除組。由於您按年份分組,但第二和第三行具有不同的年份值,因此不會像您期望的那樣將它們分組在一行中。 – subro
[部分數據透視不帶樞軸運算符]的可能重複(https://stackoverflow.com/questions/12542711/partial-pivot-without-pivot-operator) –
其中[DBMS](https://en.wikipedia.org/ wiki/DBMS)你在用嗎? Postgres的?甲骨文? –