Question

我想使用查询一次选择1000行：

<?php

如何在for循环中从此表中获取下一组1000行？

Answer 1

我建议您使用$ curl https://bitbucket.org/site/oauth2/access_token \ -d grant_type=client_credentials \ -u dqN7QFLwJEcHsHadYw:pzvZG25WEDqbm9aeUVRHtQRHgTRgDr9t { "access_token": "He1rBW1eYAzmT3ePJcvYDtkIcF1Pb1izZHo8oqpKMEL5ivsku71qkjfumVgR2bWsCiRM7XeEmbVffxU92w==", "scopes": "repository email", "expires_in": 3600, "refresh_token": "pfcnxSpXNPAeTcYhcQ", "token_type": "bearer" } $ git clone "https://x-token-auth:JU5dAtlMD30BisLpDkIap7T18Ry9v6p0Xif4owkQUyen_rLx5_B3PjjeqhLhpde0ezR1wyGLeqYE2HA49A==@bitbucket.org/evzijst/crypt" Cloning into 'crypt'... remote: Counting objects: 26, done. remote: Compressing objects: 100% (25/25), done. remote: Total 26 (delta 8), reused 0 (delta 0) Unpacking objects: 100% (26/26), done. Checking connectivity... done.这样的功能:(我的ROW_NUMBER()是您的PK）

id

接下来：

SELECT M.* 
FROM (
    SELECT MEMBERID_1M.*, ROW_NUMBER() OVER (ORDER BY id) As rn
    FROM MEMBERID_1M ) M
WHERE 
    (rn <= 1000)

页面SELECT M.* FROM ( SELECT MEMBERID_1M.*, ROW_NUMBER() OVER (ORDER BY id) As rn FROM MEMBERID_1M ) M WHERE (rn > 1000) AND (rn <= 2000)：

:i

Answer 2

重现answer

只有一种相当复杂的方法可以做到这一点，这对Oracle来说真的很痛苦。他们应该只实现LIMIT / OFFSET条款......

在的where子句选择了行之后，rownum被分配，因此rownum必须始终以1开头。where rownum > x将始终评估为false。

此外，在完成排序之前，rownum会被分配，因此rownum的顺序与订单的顺序不同。

您可以通过子选择来解决这两个问题：

select a,b,c, rn from ( select a,b,c, rownum rn from ( select a,b,c from the_table where x = ? order by c) where rownum < Y) where rn > X

如果您不需要排序（但仅限于此），您可以简化为

select a,b,c, rn from ( select a,b,c, rownum rn from the_table where rownum < Y ) where rn > X

Answer 3

您应该在服务器端进行分页。请使用此查询更多细节请参考此链接 http://www.oracle.com/technetwork/issue-archive/2007/07-jan/o17asktom-093877.html

select * 
  from 
( select rownum rnum, a.*
    from (SELECT * FROM MEMBERID_1M ) a
   where rownum <= :M )
where rnum >= :N;

从Oracle表中获取1000行集

3 个答案: