SQL 划分一个字段 If

Question

我正在尝试构建一个查询以从一篇文章中获取 X 组件的最小库存。想象一台电脑，它有内存、主板等。我可以轻松获得最小组件数量，但是，我们通常在要构建的计算机中放置 2 个 RAM，因此，我希望查询获得 RAMs/2.

的 StockValue

这是我的查询：

SELECT A1.Artigo AS Artigo,
       A1.Descricao AS Descricao,
       MIN(AA.StkActual) AS Stock,
       0 AS QuantidadeEmEncomendasPendentes,
       'Componente Stock' AS Id
FROM Artigo A1
     INNER JOIN ComponentesArtigos CA ON CA.ArtigoComposto = A1.Artigo
     INNER JOIN Artigo A2 ON A2.Artigo = CA.Componente
                         AND (A2.Familia = 98
                           OR A2.Familia = 45
                           OR A2.Familia = 39
                           OR A2.Familia = 37
                           OR A2.Familia = 38)
     INNER JOIN ArtigoArmazem AA ON AA.Artigo = A2.Artigo
                                AND AA.Armazem = 'A7'
GROUP BY A1.Artigo,
         A1.Descricao
HAVING A1.Artigo = '0180005132';

你需要知道的事情： min(AA.StkActual) 是我正在谈论的 StockValue。 RAM 由系列定义 (A2.Familia = 39)

我不想将查询结果除以2，我想将component/article which family = 39 的股票除以2

Answer 1

如果我没理解错的话，你想要一个有条件的最低限度：

SELECT A1.Artigo AS Artigo,
       A1.Descricao AS Descricao,
       MIN(CASE WHEN A2.familia = 38 THEN AA.StkActual / 2 ELSE AA.StkActual END) AS Stock,
       0 AS QuantidadeEmEncomendasPendentes,
       'Componente Stock' AS Id
. . .

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