SQL Server存儲過程使用CHAR的parm

Question

這一個不工作的優良：

ALTER PROCEDURE rconte.spPesquisaPesIdDadoCodigo24 
    (
    @pPesCodigo24 char 
    ) 
    AS 
    SELECT pesId FROM tblPesquisas where pesIdentificadorRandomico24ParaEmail = @pPesCodigo24 
    RETURN 

---

這一個精品工程：

ALTER PROCEDURE rconte.spPesquisaPesIdDadoCodigo24 
    (
    @pPesCodigo24 char(24) 
    ) 
    AS 
    SELECT pesId FROM tblPesquisas where pesIdentificadorRandomico24ParaEmail = @pPesCodigo24 
    RETURN 

---

爲什麼，好嗎？

Answer 1

監守默認長度爲1

但是這取決於你如何使用它

同時一定要閱讀本

http://beyondrelational.com/blogs/madhivanan/archive/2007/12/04/column-length-and-data-length.aspx