select A from B where C=‘D’and E=‘F’ 如果 F=null 则把E='F' 换成 M='N'select A from B where C=‘D’and M=‘N’ 求写成一个select语句 用的是DB2数据库 C和E都是主keyselect A from B where C=‘D’and E=nvl(‘F’,E) and
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selectAfromBwhereC=‘D’andE=‘F’如果F=null则把E=''F''换成M=''N''selectAfromBwhereC=‘D’andM=‘N’求写成一个select语句用的是DB
select A from B where C=‘D’and E=‘F’ 如果 F=null 则把E='F' 换成 M='N'select A from B where C=‘D’and M=‘N’ 求写成一个select语句 用的是DB2数据库 C和E都是主keyselect A from B where C=‘D’and E=nvl(‘F’,E) and
select A from B where C=‘D’and E=‘F’ 如果 F=null 则把E='F' 换成 M='N'
select A from B where C=‘D’and M=‘N’ 求写成一个select语句 用的是DB2数据库 C和E都是主key
select A from B where C=‘D’and E=nvl(‘F’,E) and M=decode('F',null,E,'N');
我已经知道了
select A from B where C=‘D’and E=‘F’ 如果 F=null 则把E='F' 换成 M='N'select A from B where C=‘D’and M=‘N’ 求写成一个select语句 用的是DB2数据库 C和E都是主keyselect A from B where C=‘D’and E=nvl(‘F’,E) and
db2 "select A from B where C=\‘D\’and M=\‘N\’ "
E是主key都能为空啊?么意思呢
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