informix SQL语句分析Select Count(*) From acnt360zz@ahenacnt:acnt19 Where Exists(Select 1 From acnt3
informix SQL语句分析 Select Count(*) From acnt360zz@ahenacnt:acnt19 Where Exists(Select 1 From acnt360zz@ahenacnt:acnt03 Where unitcode='41010000' And articlecode='UU010153' And useflag[1]='1' And gradeflag[1]='2') And acbookcode='11' And unitcode='41010000' And itemcode='2112' And 'UU010153' Matches trim(articlecode)||'*' And seqno= 3 And articlecode[1,2] In ('UU','QQ','PP','FF','CC','HH'); 这条语句查询的表是什么?是acnt360zz@ahenacnt:acnt19? 还是acnt19?,那么acnt360zz@ahenacnt又是什么? articlecode[1,2] In ('UU','QQ','PP','FF','CC','HH'); articlecode[1,2]这个又怎么理解?