Question

我收到了以下sql请求，我想知道是否可以让它更快地运行。我可以在这里改变什么加速它？它目前执行0.24秒。

SELECT RECNO 
FROM ( SELECT T.ID, T.RECNO, T.STATE, T.TYPEID 
      FROM SOME_TABLE T 
      ORDER BY T.ID ) 
WHERE ROWNUM = 1 AND TYPEID = 123123 AND STATE = 123;

Answer 1

如果您使用的是Oracle 12c +

，则可以使用OFFSET-FETCH

SELECT * FROM SOME_TABLE T 
Where TYPEID = 123123 AND STATE = 123;
ORDER BY T.ID          
FETCH NEXT 1 ROWS ONLY --OFFSET 0 ROWS FETCH NEXT 1 ROWS ONLY

虽然对表现不太确定

Answer 2

试试这个：

SELECT RECNO 
FROM ( SELECT T.ID, T.RECNO, T.STATE, T.TYPEID 
       FROM SOME_TABLE T 
       where TYPEID = 123123 AND STATE = 123
       ORDER BY T.ID ) a
  WHERE ROWNUM = 1

更快地发出sql请求

2 个答案: