在sql的case語句相當於常用的程式設計邏輯if ，else，只要前面的條件滿足，就不會再去執行下面的語句
例子：select principal_ids,principal_names from materials_data
where material_category like '%z003%' and department_name = '新產品開發中心'
and part_no like
case
when (select count(1) from materials_data where material_category like '%z003%' and department_name = '新產品開發中心'
and part_no like '%e06%' ) >= 1 then '%e06%'
when (select count(1) from materials_data where material_category like '%z003%' and department_name = '新產品開發中心'
and part_no like '%e06%' ) < 1 then ''
end
也可以寫成如下：
select principal_ids,principal_names from materials_data
where material_category like '%z003%' and department_name = '新產品開發中心'
and part_no like
case
when (select count(1) from materials_data where material_category like '%z003%' and department_name = '新產品開發中心'
and part_no like'%e06%' ) > 1 then '%e06%'
when (select count(1) from materials_data where material_category like '%z003%' and department_name = '新產品開發中心'
and part_no like '%e06%' ) < 1 then ''
else '%e06%' end
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