带CHAR参数的SQL Server存储过程

Question

这一个不能正常工作：

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

---

这个工作原理：

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

---

告诉我为什么 ？

Answer 1

因为默认长度是1

但这取决于您的使用方式

另外请务必阅读本

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