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    sql中参数过多利用变量替换参数的方法
    工作中遇到一个需求,需要非常多的参数,例如如下sql,
    复制代码 代码如下:

    select
    ff.fundsc||'-'||ff.fundtzfs||'-'||ff.fundcjfl||'-'||ff.fundonefl||'-'||ff.fundtowfl catagory,
    sf.scode,replace(sf.fund5,'型证券投资基金','')fund5,sf.fund4,sf.fund10,
    (select to_date(tradedate,'yyyy-MM-dd') from sdc_fundnetassetvalue where scode=sf.scode and tradedate in
    (select max(tradedate) from sdc_fundnetassetvalue where scode=sf.scode and to_date(tradedate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and tradedate=20120801) and rownum2) trdatedate,
    (select unitvalue from sdc_fundnetassetvalue where scode=sf.scode and tradedate in
    (select max(tradedate) from sdc_fundnetassetvalue where scode=sf.scode and to_date(tradedate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and tradedate=20120801) and rownum2) fejz,
    (select accumulatedunitvalue from sdc_fundnetassetvalue where scode=sf.scode and tradedate in
    (select max(tradedate) from sdc_fundnetassetvalue where scode=sf.scode and to_date(tradedate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and tradedate=20120801) and rownum2) feljjz,
    (select f30004_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2) gqyzjzzzl,
    (select f30006_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2) gqyyjzzzl,
    decode((select f30007_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30007_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) gqsgyjzzzl,
    row_number() over(partition by ff.fundsc||'-'||ff.fundtzfs||'-'||ff.fundcjfl||'-'||ff.fundonefl||'-'||ff.fundtowfl
    order by decode((select f30007_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30007_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) desc) sgy,
    decode((select f30008_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30008_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) gqbnjzzzl,
    row_number() over(partition by ff.fundsc||'-'||ff.fundtzfs||'-'||ff.fundcjfl||'-'||ff.fundonefl||'-'||ff.fundtowfl
    order by decode((select f30008_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30008_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) desc) bn,
    decode((select F30017_30003 from si_fund_30003 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30003 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select F30017_30003 from si_fund_30003 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30003 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) jinnian,
    row_number() over(partition by ff.fundsc||'-'||ff.fundtzfs||'-'||ff.fundcjfl||'-'||ff.fundonefl||'-'||ff.fundtowfl
    order by decode((select F30017_30003 from si_fund_30003 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30003 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select F30017_30003 from si_fund_30003 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30003 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) desc) jn,
    decode((select f30009_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30009_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) gqynjzzzl,
    row_number() over(partition by ff.fundsc||'-'||ff.fundtzfs||'-'||ff.fundcjfl||'-'||ff.fundonefl||'-'||ff.fundtowfl
    order by decode((select f30009_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30009_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) desc) gqyn,
    decode((select f30010_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30010_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) gqlnjzzzl,
    row_number() over(partition by ff.fundsc||'-'||ff.fundtzfs||'-'||ff.fundcjfl||'-'||ff.fundonefl||'-'||ff.fundtowfl
    order by decode((select f30010_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30010_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) desc) gqln,
    decode((select f30011_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),
    null,'-',to_char((select f30011_30002 from si_fund_30002 where f_fundcode=sf.scode and f_type=0 and f_tradingdate in
    (select max(f_tradingdate) from si_fund_30002 where f_fundcode=sf.scode and to_date(f_tradingdate,'yyyyMMdd')>=(to_date(20120801,'yyyyMMdd')-10) and f_tradingdate=20120801) and rownum2),'fm999999990.9999')) gqsnjzzzl

    from
    (select
    b.scode,b.fund5,b.fund4,b.fund10
    from
    sdc_fundbase b left join sdc_security a on b.scode=a.scode and b.mktcode=a.mktcode and b.fund49=a.stype
    where
    b.scode in (select t.fundcode from fund_fundcategoryone t where (t.fundtzfs='开放式' or t.fundtzfs='封闭式') and t.fundonefl!='货币市场基金' and t.fundonefl!='交易类' )
    and (a.enddate>=to_date(20120801,'yyyy-MM-dd') or a.enddate is null or a.enddate=to_date(19000101,'yyyy-MM-dd'))
    and a.stype in (6,7) order by scode
    ) sf
    left join fund_fundcategoryone ff on sf.scode = ff.fundcode and ff.fundonefl!='交易类'

    非常复杂,不仔细介绍,此时需要将20120801处全部变成参数传入,,只写参数就得累死我,下面方法可以节省我的好多工作量,在最内部函数中修改select
    b.scode,b.fund5,b.fund4,b.fund10,20120801 tdate
    from
    将20120801用tdate变量来代替,这样传入的参数就用tdate来表示就可以了。
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    sql中参数过多利用变量替换参数的方法 sql,中,参数,过多,利用,变量,