SQL小技巧（一）拼音首字母的模糊查询

基于Microsoft SQL Server 的标量值函数fun_GetPy，借鉴其他优秀的博主文章，此处贴出源码，以及使用方法

1、打开新建查询，贴如下代码，F5

/****** Object:  UserDefinedFunction [dbo].[fun_GetPy]    Script Date: 11/01/2019 11:07:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE FUNCTION   [dbo].[fun_GetPy](@str   NVARCHAR(4000))
RETURNS   NVARCHAR(4000)
AS
BEGIN
DECLARE   @strlen   INT,@re   NVARCHAR(4000)
DECLARE   @t   TABLE(chr   NCHAR(1)   COLLATE   Chinese_PRC_CI_AS,letter   NCHAR(1))
INSERT   INTO   @t(chr,letter)
    SELECT   '吖 ', 'A '   UNION   ALL   SELECT   '八 ', 'B '   UNION   ALL
    SELECT   '嚓 ', 'C '   UNION   ALL   SELECT   '咑 ', 'D '   UNION   ALL
    SELECT   '妸 ', 'E '   UNION   ALL   SELECT   '发 ', 'F '   UNION   ALL
    SELECT   '旮 ', 'G '   UNION   ALL   SELECT   '铪 ', 'H '   UNION   ALL
    SELECT   '丌 ', 'J '   UNION   ALL   SELECT   '咔 ', 'K '   UNION   ALL
    SELECT   '垃 ', 'L '   UNION   ALL   SELECT   '呒 ', 'M '   UNION   ALL
    SELECT   '拏 ', 'N '   UNION   ALL   SELECT   '噢 ', 'O '   UNION   ALL
    SELECT   '妑 ', 'P '   UNION   ALL   SELECT   '七 ', 'Q '   UNION   ALL
    SELECT   '呥 ', 'R '   UNION   ALL   SELECT   '仨 ', 'S '   UNION   ALL
    SELECT   '他 ', 'T '   UNION   ALL   SELECT   '屲 ', 'W '   UNION   ALL
    SELECT   '夕 ', 'X '   UNION   ALL   SELECT   '丫 ', 'Y '   UNION   ALL
    SELECT   '帀 ', 'Z '
    SELECT   @strlen=LEN(@str),@re= ' '
    WHILE   @strlen> 0
    BEGIN
        SELECT   TOP   1   @re=letter+@re,@strlen=@strlen-1
            FROM   @t   a   WHERE   chr <=SUBSTRING(@str,@strlen,1)
            ORDER   BY   chr   DESC
        IF   @@rowcount=0
            SELECT   @re=SUBSTRING(@str,@strlen,1)+@re,@strlen=@strlen-1
    END
    RETURN(@re)
END
GO

2、执行后，刷新数据库，在可编程性下标量值函数中会看到此函数，安装了SQL Prompt的小伙伴们，需要Refresh Suggestions。

注：提取码为 s4ka 。

SQL Prompt 提供的版本完美兼容数据库2008，2014，如不兼容自行百度下载

3、使用方法

SELECT *FROM [TableName] WHERE 1=1 AND (dbo.fun_GetPy([字段]) LIKE '%"+[参数]+"%' OR [字段] LIKE '%"+参数+"%')"

本文个人收藏使用，如有侵权，请联系作者删除！