摘要： //deletedelete from table1 a where exists (select 1 from table2 b where a.col1 = b.col1)//insertinsert into table1 ( col1, col2)select 'a', 'b' from dualwhere not exists (select 1 from table2 where index = ?)//updateupdate /*+ bypass_ujvc */ (select col1 from table1 a, table2b where 阅读全文