Question

我正在从Crystal迁移报告，我可以创建一个列并使用此公式填充...

if ({@SD Profile}="null") and ({@HD Profile 2}="null")
then ""
else
    if ({@HD Profile 2}="null")
    then "SD only"
    else
        if ({@SD Profile}="null")
        then "HD only"
        else 
            if({@SD Companion}="1")
            then "HD+SD"
            else "HD/SD"

我想用SQL完成同样的事情，我根据其他3列中的数据填充列的值。注意我没有在只插入报告的数据库中添加一列。

我使用

在SELECT语句中创建了空列

CAST(NULL AS VARCHAR(30)) as "Content Type",
"SD_format"."name" as "SD Format",
"HD_format"."name" as "HD Format",
"destination"."sd_companion_required_flag"

基本上类似......如果SD_Format.name ='null'则Content_Type =''etc。

Answer 1

您应该能够更换“如果＆＃39;一个案例的陈述＆＃39;语句：

select
  case
    when SD_Profile is null and HD_Profile is null then ''
    when HD_Profile is null then 'SD only'
    when SD_Profile is null then 'HD only'
    when Destination = '1' then 'HD + SD'
    else 'HD/SD'
  end as 'Content_Type'
from ...

Answer 2

*"SD_format"."name" as "SD Format",
 "HD_format"."name" as "HD Format",
    case
   when "SD_format"."name" is null and "HD_format"."name" is null then ''
   when "HD_format"."name" is null then 'SD only'
   when "SD_format"."name" is null then 'HD only'
   when "destination"."sd_companion_required_flag" = '1' then 'HD + SD'
   else 'HD/SD'
  end as "Content_Type",

创建一个列并根据现有数据SQL填充

2 个答案: