Question

我在表中表示firstname和lastname的两个字段，并且必须放在视图中的单个字段中。在这样做的同时，我必须全部放入小型大写。

    SELECT 
    /* NAME*/ COALESCE(UPPER(SUBSTRING(LastName, 1, 1)), '') + COALESCE(LOWER(SUBSTRING(LastName, 2, LEN(LastName)-1)), '') + ' ' + 
    COALESCE(UPPER(SUBSTRING(FirstName, 1, 1)), '') + COALESCE(LOWER(SUBSTRING(FirstName, 2, LEN(FirstName)-1)), '') AS Name

这样可以正常工作，但是一些记录已插入，一个字段为空，因此子字符串会生成错误并停止所有查询。

我该如何管理？

Answer 1

DECLARE @LastName NVARCHAR(30)= '';
DECLARE @FirstName NVARCHAR(30)= 'jhon';   

SELECT CASE WHEN (LEN(@LastName) > 0 AND @LastName IS NOT NULL)
     THEN 
      ISNULL(UPPER(LEFT(@LastName, 1)) + LOWER(RIGHT(@LastName, LEN(@LastName)-1)) + ' ', '')
     ELSE '' END  
   + CASE WHEN (LEN(@FirstName) > 0 AND @FirstName IS NOT NULL)
     THEN 
      ISNULL(UPPER(LEFT(@FirstName, 1)) + LOWER(RIGHT(@FirstName, LEN(@FirstName)-1)), '')
     ELSE '' END    AS Name

Answer 2

试试这个：

select 
replace(lower(lastname),SUBSTRING(lastName , 1, 1),UPPER(SUBSTRING(lastName , 1, 1))) + ' ' +
replace(lower(firstname),SUBSTRING(firstName , 1, 1),UPPER(SUBSTRING(firstName , 1, 1)))

使用空记录管理子字符串

2 个答案: