帮我优化以下sql select s.* from ifare.structred_rule s right join ( select MAX(r.VERSION) vers, r.status, r.tbl_no, r.live_from, r.data_type, r. source from ifare.structred_rule r where (r.status in ('8', '')) group by r.status, r.tbl_no, r.live_from, r.data_type, r. source) tp on s.version = tp.vers and s.tbl_no = tp.tbl_no and s.status = tp.status and s.live_from = tp.live_from and s.data_type = tp.data_type and s.SOURCE = tp.source and s.status <> '-1' where s.version ='00001' and s.remark = 'D' and s.audited_date >= '20211010' and s.audited_date <='20211011' order by s.db_date asc, s.tbl_no asc, s.version desc
时间: 2023-11-27 09:53:22 浏览: 136
可以尝试以下优化方式:
1. 索引优化:为表 ifare.structred_rule 中的 audited_date、version、status、tbl_no、live_from、data_type、source 字段创建索引,可以提高查询效率。
2. 子查询优化:将子查询转换为临时表,避免每次查询都要执行子查询。
3. 分批加载:如果数据量较大,可以考虑分批加载,减少一次性加载过多数据的压力。
优化后的 SQL 可以是这样的:
```
-- 创建临时表
CREATE TEMPORARY TABLE temp_rule AS
SELECT MAX(version) vers, status, tbl_no, live_from, data_type, source
FROM ifare.structred_rule
WHERE status IN ('8', '')
GROUP BY status, tbl_no, live_from, data_type, source;
-- 查询临时表和 ifare.structred_rule 表
SELECT s.*
FROM ifare.structred_rule s
RIGHT JOIN temp_rule tp ON s.version = tp.vers
AND s.tbl_no = tp.tbl_no
AND s.status = tp.status
AND s.live_from = tp.live_from
AND s.data_type = tp.data_type
AND s.source = tp.source
AND s.status <> '-1'
WHERE s.version = '00001'
AND s.remark = 'D'
AND s.audited_date >= '20211010'
AND s.audited_date <= '20211011'
ORDER BY s.db_date ASC, s.tbl_no ASC, s.version DESC;
```
希望对你有帮助!
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