需要有关复杂案例语句 SQL 2005 的帮助答案

【问题标题】：Need help with complex case statement SQL 2005需要有关复杂案例语句 SQL 2005 的帮助
【发布时间】：2011-01-05 21:55:27
【问题描述】：

我不确定我想要做什么的语法。我需要根据条件选择几个地址字段。

逻辑是可靠的，但似乎语法不正确。它在关键字“Case”、“Else”、“Else”附近出现“语法不正确”的错误。思路是如果isprimary=1则将地址插入表中，如果没有primary则插入isactive=1的最新地址，如果没有active则插入最新地址。

请帮忙

-- 为记录 02 选择一个最佳地址

DECLARE @ygcaddress TABLE
(
[AccountID] varchar(10),
[Address1] varchar(25),
[City] varchar(22),
[State] varchar(3),
[Zip] varchar(9)
)
INSERT INTO @ygcaddress
CASE
WHEN Address.IsPrimary=1
THEN 
SELECT
LEFT(Address.AddressLine1,25),
Address.City,
[Lookup].LookupValue,
Address.Zip
FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID)
INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID)
INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID)
INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID
WHERE Address.IsPrimary=1
ELSE
CASE
WHEN Address.IsActive=1
THEN
SELECT TOP 1
LEFT(Address.AddressLine1,25),
Address.City,
[Lookup].LookupValue,
Address.Zip
FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID)
INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID)
INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID)
INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID
WHERE Address.IsActive=1
ELSE
SELECT TOP 1
LEFT(Address.AddressLine1,25),
Address.City,
[Lookup].LookupValue,
Address.Zip
FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID)
INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID)
INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID)
INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID
END
END

【问题讨论】：

能否在不丢失问题本质的情况下简化查询？

标签： sql sql-server-2005 select case

【解决方案1】：

试试这个，从我可以看出它在你原来的问题中看起来像一个语法错误：

DECLARE @ygcaddress TABLE
(
    [AccountID] varchar(10),
    [Address1] varchar(25),
    [City] varchar(22),
    [State] varchar(3),
    [Zip] varchar(9)
)

INSERT INTO @ygcaddress
    CASE 

        WHEN Address.IsPrimary=1
        THEN 
        SELECT
        LEFT(Address.AddressLine1,25),
        Address.City,
        [Lookup].LookupValue,
        Address.Zip
        FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID)
            INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID)
            INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID)
            INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID
            WHERE Address.IsPrimary=1

        WHEN Address.IsActive=1
        THEN
        SELECT TOP 1
        LEFT(Address.AddressLine1,25),
        Address.City,
        [Lookup].LookupValue,
        Address.Zip
        FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID)
            INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID)
            INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID)
            INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID
            WHERE Address.IsActive=1

        ELSE
        SELECT TOP 1
        LEFT(Address.AddressLine1,25),
        Address.City,
        [Lookup].LookupValue,
        Address.Zip
        FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID)
            INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID)
            INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID)
            INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID
    END

【讨论】：

【解决方案2】：

为案例结果添加了括号，这应该有效（至少在语法上）。

--Select One best address for Record 02 
DECLARE @ygcaddress TABLE ( [AccountID] varchar(10), [Address1] varchar(25), [City] varchar(22), [State] varchar(3), [Zip] varchar(9) ) 
INSERT INTO @ygcaddress 
SELECT 
CASE WHEN Address.IsPrimary=1 THEN 
    (
        SELECT LEFT(Address.AddressLine1,25), Address.City, [Lookup].LookupValue, Address.Zip 
        FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID) INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID) INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID) INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID WHERE Address.IsPrimary=1 
    )
ELSE 
    CASE WHEN Address.IsActive=1 THEN 
        (SELECT TOP 1 LEFT(Address.AddressLine1,25), Address.City, [Lookup].LookupValue, Address.Zip FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID) INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID) INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID) INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID WHERE Address.IsActive=1 )
    ELSE 
        (SELECT TOP 1 LEFT(Address.AddressLine1,25), Address.City, [Lookup].LookupValue, Address.Zip FROM (((AccountPerson INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID) INNER JOIN Address ON AccountPerson.PersonID=Address.PersonID) INNER JOIN @ygcaddress y ON Account.AccountID=y.AccountID) INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID )
    END
END

【讨论】：

【解决方案3】：

如果不深入研究，您似乎至少缺少“VALUES”关键字。 INSERT 语句的框架语法是

INSERT INTO table_name (column1, column2, column3,...) 值（值 1，值 2，值 3，...）

我建议在尝试替换任何更复杂的内容之前，使用文字字符串（或其他任何内容）编写正确的 INSERT 语句。

【讨论】：

【解决方案4】：

如果我正确理解了这个问题，我认为您根本不需要 CASE 语句：CASE 语句返回一个值表达式，而不是您尝试创建的元组。（至少在我最熟悉的 SQL 数据库 SQL Server 中是这样）

编辑删除我使用 UNION 的第一个建议解决方案，我意识到这是不正确的。

再次编辑：

试试这样的：

INSERT INTO @ygcaddress 
SELECT
     Account.AccountID
    ,LEFT(Address.AddressLine1,25)
    ,Address.City
    ,[Lookup].LookupValue
    ,Address.Zip 
FROM AccountPerson 
INNER JOIN Account ON AccountPerson.AccountID=Account.AccountID
INNER JOIN 
(
    SELECT TOP 1 
    A1.*
    CASE 
        WHEN A1.IsPrimary=1 THEN 10
        WHEN A1.IsPrimary=0 AND A1.IsActive=1 THEN 5
        ELSE 1
    END [Rank]
    FROM Address A1
    ORDER BY [Rank] DESC
) Address ON AccountPerson.PersonID=Address.PersonID 
INNER JOIN [Lookup] ON Address.StateID=[Lookup].LookupID

【讨论】：