将 mysql 查询转换为 MS SQL

Question

嗨，我想知道是否有人可以帮助我，我有以下 MySQL 查询（摘录）：

concat_ws('\n', 
                    IF(LENGTH(PafAddress.line1),PafAddress.line1,NULL),
                    IF(LENGTH(PafAddress.line2),PafAddress.line2,NULL),
                    IF(LENGTH(PafAddress.line3),PafAddress.line3,NULL),
                    IF(LENGTH(PafAddress.line4),PafAddress.line4,NULL),
                    IF(LENGTH(PafAddress.Line5),PafAddress.line5,NULL),
                    IF(LENGTH(PafAddress.post_town),PafAddress.post_town,NULL),
                    IF(LENGTH(PafAddress.county),PafAddress.county,NULL),
                    IF(LENGTH(PafAddress.postcode),PafAddress.postcode,NULL)
) AS AddressLabel

从另一个 table 获取多个地址字段并将其放入备忘录字段格式，带换行符，并删除空地址行。

在 MySQL 中完美运行。

我现在正尝试将此实现到 PHP 网站上，该网站是运行由 MS Access（不是我的选择！）并且它不喜欢语法。

我不是 MS Access 专家，所以如果有人告诉我如何在 Access 中实现这一点，我将不胜感激 SQL。

Answer 1

尝试使用 IIF(condition, truevalue, falsevalue) 语句。此外，您可以使用 &

连接

这里有两个参考供您参考： article about using IIF 和 article about concatenating using & 和 article about len() instead of length()

因此您的代码可能如下所示：

IIF(Len(PafAddress.line1)>0,PafAddress.line1,"") & " " &
IIF(Len(PafAddress.line2)>0,PafAddress.line2,"") & " " &
IIF(Len(PafAddress.line3)>0,PafAddress.line3,"") & " " &
IIF(Len(PafAddress.line4)>0,PafAddress.line4,"") & " " &
IIF(Len(PafAddress.Line5)>0,PafAddress.line5,"") & " " &
IIF(Len(PafAddress.post_town)>0,PafAddress.post_town,"") & " " &
IIF(Len(PafAddress.county)>0,PafAddress.county,"") & " " &
IIF(Len(PafAddress.postcode)>0,PafAddress.postcode,"") 
AS AddressLabel

要跳过空记录，请尝试使用此方法：

iif( Len(PafAddress.line1)>0 
     OR Len(PafAddress.line2)>0
     OR Len(PafAddress.line3)>0
     OR Len(PafAddress.line4)>0
     OR Len(PafAddress.line5)>0
     OR Len(PafAddress.post_town)>0
     OR Len(PafAddress.county)>0
     OR Len(PafAddress.postcode)>0 
,
IIF(Len(PafAddress.line1)>0,PafAddress.line1,"") & " " &
IIF(Len(PafAddress.line2)>0,PafAddress.line2,"") & " " &
IIF(Len(PafAddress.line3)>0,PafAddress.line3,"") & " " &
IIF(Len(PafAddress.line4)>0,PafAddress.line4,"") & " " &
IIF(Len(PafAddress.Line5)>0,PafAddress.line5,"") & " " &
IIF(Len(PafAddress.post_town)>0,PafAddress.post_town,"") & " " &
IIF(Len(PafAddress.county)>0,PafAddress.county,"") & " " &
IIF(Len(PafAddress.postcode)>0,PafAddress.postcode,"" & char(13) & char(10) )
,"") 
AS AddressLabel

在这个查询中，（1st）检查任何值的长度是否大于0...如果是，用CRLF输出地址行；否则输出一个空字符串。

将 mysql 查询转换为 MS SQL

Converting mysql query to MS SQL

php

ms-access