下面的语句有什么东东,如何修改

下面的语句有什么错误,怎么修改pb连的oracle库to_char(b.cshsj, yyyy.mm.dd) c_endsj and to_char(b.

下面的语句有什么错误,怎么修改
pb连的oracle库
 to_char(b.cshsj, 'yyyy.mm.dd') <= c_endsj and to_char(b.cshsj, 'yyyy.mm.dd') >= c_startsj 


[解决办法]
to_char(b.cshsj, 'yyyy.mm.dd') <= :c_endsj and to_char(b.cshsj, 'yyyy.mm.dd') >= :c_startsj
[解决办法]

探讨

to_char(b.cshsj, 'yyyy.mm.dd') <= :c_endsj and to_char(b.cshsj, 'yyyy.mm.dd') >= :c_startsj