优化以下SQL语句,提高查询效率:select O_DWBH,O_TIME,D_BZ,O_JRBH,O_XTZH,O_DWMC,D_SJLY,O_BFZH,O_BFZHMC,O_BFJGBH, O_DFDWBH,O_DFDWMC,O_DFZH,O_DFXTZH,O_DFZHMC,O_DFJGBH,O_DFYHBH,O_YHYWBH, O_JYJE,O_JYJE_ZS,O_JYFX,O_JYLXBH,O_JYLXMC,O_ZY,O_BZ,O_GUID,O_JYSJ,D_YRBQJE, D_YRBQYBJE,D_YRBQBS,D_YRHJJE,D_YRHJYBJE,D_YYBQJE,D_YYBQYBJE,D_YYBQBS,D_YYHJJE, D_YYHJYBJE,D_YNBQJE,D_YNBQYBJE,D_YNBQBS,D_YNHJJE,D_YNHJYBJE,D_YRLRJE,D_YRLRYBJE, D_YRLRBS,D_YYLRJE,D_YYLRYBJE,D_YYLRBS,D_YNLRJE,D_YNLRYBJE,D_YNLRBS,D_YRLCJE, D_YRLCYBJE,D_YRLCBS,D_YYLCJE,D_YYLCYBJE,D_YYLCBS,D_YNLCJE,D_YNLCYBJE,D_YNLCBS from ( select A.*,B.O_DFZH as M1,B.O_JYJE as N1,B.O_DWBH as P1 from (select * from DWM_NJYLS where O_DWBH = '10600000' AND ( O_DFZH not in (select REPLACE(O_ZH,'-','') AS O_ZH from ADS_ZHXX) or O_DFZH is NULL OR O_DFZH=' ' ) ) A LEFT JOIN (select * from DWM_NJYLS where O_JRBH = '14373' AND ( O_DFZH not in (select REPLACE(O_ZH,'-','') AS O_ZH from ADS_ZHXX) or O_DFZH is NULL OR O_DFZH=' ' ) ) B ON A.O_DFZH = B.O_DFZH and A.O_TIME = B.O_TIME and A.O_JYFX = B.O_JYFX and A.O_JYJE = B.O_JYJE and A.D_BZ = B.D_BZ ) where O_DFZH is not null AND O_DFZH <>' ' and P1 is null
时间: 2023-10-23 08:14:25 浏览: 49
可以通过以下方式优化该SQL语句:
1. 使用INNER JOIN替代LEFT JOIN:由于查询中使用了多个条件进行连接,INNER JOIN可以更有效地过滤数据,提高查询效率。
2. 使用EXISTS替代子查询:将子查询改写为EXISTS子句,可以减少查询的计算量。
3. 使用索引:为O_DWBH、O_DFZH和O_JRBH列创建索引,以加快查询速度。
优化后的SQL语句如下:
```sql
SELECT
O_DWBH, O_TIME, D_BZ, O_JRBH, O_XTZH, O_DWMC, D_SJLY, O_BFZH, O_BFZHMC, O_BFJGBH,
O_DFDWBH, O_DFDWMC, O_DFZH, O_DFXTZH, O_DFZHMC, O_DFJGBH, O_DFYHBH, O_YHYWBH,
O_JYJE, O_JYJE_ZS, O_JYFX, O_JYLXBH, O_JYLXMC, O_ZY, O_BZ, O_GUID, O_JYSJ, D_YRBQJE,
D_YRBQYBJE, D_YRBQBS, D_YRHJJE, D_YRHJYBJE, D_YYBQJE, D_YYBQYBJE, D_YYBQBS, D_YYHJJE,
D_YYHJYBJE, D_YNBQJE, D_YNBQYBJE, D_YNBQBS, D_YNHJJE, D_YNHJYBJE, D_YRLRJE, D_YRLRYBJE,
D_YRLRBS, D_YYLRJE, D_YYLRYBJE, D_YYLRBS, D_YNLRJE, D_YNLRYBJE, D_YNLRBS, D_YRLCJE,
D_YRLCYBJE, D_YRLCBS, D_YYLCJE, D_YYLCYBJE, D_YYLCBS, D_YNLCJE, D_YNLCYBJE, D_YNLCBS
FROM
DWM_NJYLS A
WHERE
A.O_DWBH = '10600000'
AND A.O_DFZH NOT IN (SELECT REPLACE(O_ZH,'-','') AS O_ZH FROM ADS_ZHXX)
AND A.O_DFZH IS NOT NULL AND A.O_DFZH <> ' '
AND A.P1 IS NULL
AND EXISTS (
SELECT 1
FROM DWM_NJYLS B
WHERE
B.O_JRBH = '14373'
AND B.O_DFZH NOT IN (SELECT REPLACE(O_ZH,'-','') AS O_ZH FROM ADS_ZHXX)
AND B.O_DFZH IS NOT NULL AND B.O_DFZH <> ' '
AND A.O_DFZH = B.O_DFZH
AND A.O_TIME = B.O_TIME
AND A.O_JYFX = B.O_JYFX
AND A.O_JYJE = B.O_JYJE
AND A.D_BZ = B.D_BZ
);
```
请注意,这只是一种可能的优化方法,具体的优化效果可能会因数据库的结构和数据量而有所不同。建议在应用到生产环境之前进行测试和验证。