Oracle 下SQL语句怎么写 SELECT @ROWNUM := @ROWNUM + 1 AS TEMPRANK, @INCRNUM := CASE WHEN @ROWTOTAL = OBJ.YLCOUNT + 1 THEN @INCRNUM WHEN @ROWTOTAL := OBJ.YLCOUNT + 1 THEN @ROWNUM END AS FILERANK, OBJ.* FROM ( SELECT DOCINFO.TITLE, DOCINFO.DOC_ID AS DOCID, DOCINFO.DOC_TYPE AS DOCTYPE, U.USER_NAME AS AUTHORNAME, CONCAT( U.USER_NAME, '/', CASE WHEN O.SHORT_NAME = '' THEN '无' ELSE O.SHORT_NAME END ) AS USERNAME, IFNULL( DOCINFO.DOWNLOAD_NUM, 0 ) AS YLCOUNT FROM DOC_INFO DOCINFO, SYS_USERS U, SYS_ORGAN O, sys_stru WHERE DOCINFO.VALID_FLAG = '1' AND IFNULL( DOCINFO.DOWNLOAD_NUM, 0 ) != 0 AND U.USER_ID = DOCINFO.AUTHOR_ID AND sys_stru.STRU_ID = U.DEPARTMENT_ID AND O.ORGAN_ID = sys_stru.ORGAN_ID GROUP BY DOCINFO.DOC_ID, U.USER_NAME ORDER BY DOCINFO.DOWNLOAD_NUM DESC, DOCINFO.TITLE DESC ) OBJ, ( SELECT @ROWNUM := 0, @ROWTOTAL := NULL, @INCRNUM := 0 ) R
时间: 2023-11-27 13:49:13 浏览: 53
在 Oracle 中,可以将该 SQL 语句写成如下形式:
```
SELECT TEMPRANK, FILERANK, TITLE, DOCID, DOCTYPE, AUTHORNAME, USERNAME, YLCOUNT
FROM (
SELECT DOCINFO.TITLE, DOCINFO.DOC_ID AS DOCID, DOCINFO.DOC_TYPE AS DOCTYPE,
U.USER_NAME AS AUTHORNAME, CONCAT(U.USER_NAME, '/', CASE WHEN O.SHORT_NAME = '' THEN '无' ELSE O.SHORT_NAME END) AS USERNAME,
IFNULL(DOCINFO.DOWNLOAD_NUM, 0) AS YLCOUNT,
@ROWNUM := @ROWNUM + 1 AS TEMPRANK,
@INCRNUM := CASE
WHEN @ROWTOTAL = OBJ.YLCOUNT + 1 THEN @INCRNUM
WHEN @ROWTOTAL := OBJ.YLCOUNT + 1 THEN @ROWNUM
END AS FILERANK
FROM DOC_INFO DOCINFO, SYS_USERS U, SYS_ORGAN O, sys_stru
WHERE DOCINFO.VALID_FLAG = '1'
AND IFNULL(DOCINFO.DOWNLOAD_NUM, 0) != 0
AND U.USER_ID = DOCINFO.AUTHOR_ID
AND sys_stru.STRU_ID = U.DEPARTMENT_ID
AND O.ORGAN_ID = sys_stru.ORGAN_ID
GROUP BY DOCINFO.DOC_ID, U.USER_NAME
ORDER BY DOCINFO.DOWNLOAD_NUM DESC, DOCINFO.TITLE DESC
) OBJ, (SELECT @ROWNUM := 0, @ROWTOTAL := NULL, @INCRNUM := 0) R;
```
在 Oracle 中,变量需要在 SQL 语句外面进行声明和初始化。这里使用了 `@ROWNUM`、`@ROWTOTAL` 和 `@INCRNUM` 三个变量,它们都在 SQL 语句的最后一行进行了声明和初始化。
此外,由于 Oracle 对于 SQL 语句的执行顺序与 MySQL 略有不同,因此需要将临时变量的计算放在子查询中,并使用外层查询来获取这些变量的值。最终的结果集是从子查询中返回的。
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