在 sql 语句中使用多个子查询

Question

我正在尝试使用多个子查询，但出现错误。如果我删除第二个子查询，它会起作用。

错误：

Msg 512, Level 16, State 1, Line 2 Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

USE SUPERSTARIS
    SELECT lines.Item,
        Inventory.ItemAlternative,
        Inventory.OnHandPhys,
        Inventory.Allocated,
        Inventory.CostPrice,
        replace(vInventoryOptional2Values.Value, '/', '') AS Brand,
        Inventory.Optional3 AS StockStatus,
        (SELECT SUM(l.Invoiced) * -1
            FROM lines l
            WHERE l.Date >= '2014-01-01'
                AND l.Date <= '2014-01-31'
                AND l.Item = lines.Item) AS QtySoldInPeriod,
        (SELECT SUM(lines.AmountBase-lines.CostAmount)*-1
            FROM lines l
            WHERE l.Date >= '2014-01-01'
                AND l.Date <= '2014-01-31'
                AND l.Item = lines.Item) AS QtySoldInPeriod2
    FROM lines
    INNER JOIN inventory ON lines.item = Inventory.item
    INNER JOIN vInventoryOptional2Values ON Inventory.Optional2 = vInventoryOptional2Values.RecordID
    WHERE lines.Invoiced < 0
        AND Inventory.Status = 0
        AND Inventory.Optional3 <> 3
    GROUP BY Lines.Item,
        Inventory.Optional3,
        Inventory.ItemAlternative,
        Inventory.OnHandPhys,
        Inventory.CostPrice,
        vInventoryOptional2Values.Value,
        Inventory.Allocated

Answer 1

正如 Coder of Code 所写，错误是您在子查询中引用了主查询 table 而不是子查询 table。这样您就可以快速更正您的错误。但是您已经在主查询中按 lines.item 分组，因此您不需要额外的子查询来获取 SUM。

您可以简化查询 - 删除子查询：

USE SUPERSTARIS
SELECT lines.Item,
    Inventory.ItemAlternative,
    Inventory.OnHandPhys,
    Inventory.Allocated,
    Inventory.CostPrice,
    replace(vInventoryOptional2Values.Value, '/', '') AS Brand,
    Inventory.Optional3 AS StockStatus,
    -SUM(lines.Invoiced) AS QtySoldInPeriod,
    -SUM(lines.AmountBase-lines.CostAmount) AS QtySoldInPeriod2
FROM lines
INNER JOIN inventory ON lines.item = Inventory.item
INNER JOIN vInventoryOptional2Values ON Inventory.Optional2 = vInventoryOptional2Values.RecordID
WHERE lines.Invoiced < 0
    AND lines.Date >= '2014-01-01'
    AND lines.Date <= '2014-01-31'
    AND Inventory.Status = 0
    AND Inventory.Optional3 <> 3
GROUP BY Lines.Item,
    Inventory.Optional3,
    Inventory.ItemAlternative,
    Inventory.OnHandPhys,
    Inventory.CostPrice,
    vInventoryOptional2Values.Value,
    Inventory.Allocated

并做进一步优化：

USE SUPERSTARIS
SELECT Inventory.Item,
    Inventory.ItemAlternative,
    Inventory.OnHandPhys,
    Inventory.Allocated,
    Inventory.CostPrice,
    replace(vInventoryOptional2Values.Value, '/', '') AS Brand,
    Inventory.Optional3 AS StockStatus,
    l.QtySoldInPeriod,
    l.QtySoldInPeriod2
FROM (
    SELECT lines.item,
        -SUM(lines.Invoiced) AS QtySoldInPeriod,
        SUM(lines.CostAmount - lines.AmountBase) AS QtySoldInPeriod2
    FROM lines
    WHERE lines.Invoiced < 0
        AND lines.Date >= '2014-01-01'
        AND lines.Date <= '2014-01-31'
    GROUP BY Lines.Item) l
INNER JOIN inventory ON l.item = Inventory.item
    AND Inventory.Status = 0
    AND Inventory.Optional3 <> 3
INNER JOIN vInventoryOptional2Values ON Inventory.Optional2 = vInventoryOptional2Values.RecordID

在 sql 语句中使用多个子查询

Using several subqueries in sql statement

sql

sql-server-2005

subquery