最近项目中遇到了一个问题，就是返回的数据量很大，有时用户查询时，会返回10W条以上的数据，所以我想到了先建视图，然后在视图的基础上利用Oracle分页存储过程来只加载当前页的数据，这样可以显著的提高查询速度。
但是在实现功能时，却遇到了一个问题。我在页面绑定时，执行语句先得到页面共有多少条记录，语句如下：
select count(*) as Total from VIEW_EQUIPMENTINFO where EI_SBZT='06'
但是却报”未明确定义列"的错误，没道理啊，一般报这个错，都是因为多表关联时，列名不惟一，可是我是对视图进行查询，并且视图中的每一个列都不重名啊。困扰了挺长时间后，终于找到了原因，原来是我在创建视图时，没有明确指明名，我是这创建视图的代码：
CREATE OR REPLACE VIEW EIMS.VIEW_EQUIPMENTINFO
AS
SELECT * FROM EM_EQUIPMENTINFO
left join EM_EIREFERORGCODE on EM_EIREFERORGCODE.EIO_SBBSH = EM_EQUIPMENTINFO.EI_SBBSH
left join EM_FLEXIBLEFIELDS on EM_FLEXIBLEFIELDS.FF_SBBSH = EM_EQUIPMENTINFO.EI_SBBSH
GO
上面的代码是不对的，导致标题中说的问题，将视图创建语句改为如下形式后，问题解决，但是没有找到问题的根本原因：
CREATE OR REPLACE VIEW EIMS.VIEW_EQUIPMENTINFO
AS
SELECT EI_GUID, EI_SBBSH, EI_TBNY, EI_JJDWMC, EI_EJDWMC, EI_SJDWMC, EI_SIJDWMC, EI_SBJB, EI_YJBS, EI_SBMC, EI_GGXH, EI_ZBH, EI_ZCBH, EI_SBLB, EI_JLDW, EI_CLPH, EI_DPBH, EI_FDJBH, EI_FDJXH, EI_NL, EI_NLDW, EI_JXFZXS, EI_DQFZXS, EI_NH, EI_NHDWZL, EI_ZGL, EI_GLDW, EI_CD, EI_KD, EI_GD, EI_ZL, EI_CJGB, EI_CJMC, EI_CCBH, EI_CCNY, EI_GHSGB, EI_GHSMC, EI_ZYDW, EI_AZDD, EI_TCNY, EI_XYNX, EI_YZ, EI_JZ, EI_NZJL, EI_LJZJ, EI_ZSSX, EI_SBZT, EI_BDSJ, EI_JMFDS, EI_DMFDS, EI_JSXN, EI_LRNY, EI_JSZK, EI_SYQK, EI_ZWHTS, EI_LJSYS, EI_ZKDSJ, EI_SKDW, EI_ZGZTJSJ, EI_ZXSGLS, EI_LJNYXH, EI_NHF, EI_XLDS, EI_WXZT, EI_YBZ, EIO_SBBSH, EIO_JJDWDM, EIO_EJDWDM, EIO_SJDWDM, EIO_SIJDWDM, EIO_JDDM, EIO_SBZT, FF_SBBSH, FF_SBLX, FF_ZSBBSH, FF_GSDH, FF_SGQY, FF_DHQK, FF_ZJDXSJ, FF_DXNR, FF_DWZZ, FF_BZ, FF_ACI_GUID FROM EM_EQUIPMENTINFO
left join EM_EIREFERORGCODE on EM_EIREFERORGCODE.EIO_SBBSH = EM_EQUIPMENTINFO.EI_SBBSH
left join EM_FLEXIBLEFIELDS on EM_FLEXIBLEFIELDS.FF_SBBSH = EM_EQUIPMENTINFO.EI_SBBSH
GO