帮我优化如下sql:SELECT T1.quyu, T2.lastNum, T3.jdNum, T4.xcNum FROM (SELECT STREET AS quyu FROM STREET_YXW WHERE 1=1 GROUP BY STREET ) T1 LEFT JOIN ( SELECT T2.STREET_NAME AS quyu,COUNT(*) AS lastNum FROM V_FIRESAFETYREGISTER_DYC T1 LEFT JOIN V_HSE_COMB_BUILDING_INFO_PA T2 ON LEFT(T1.HOUSEID,19) = T2.BUILDING_CODE WHERE T1.LASTLOGOUTTIME IS NOT NULL and date_format(T1.LASTLOGOUTTIME,'%Y') = ? GROUP BY T2.STREET_NAME ) T2 ON T1.quyu = T2.quyu LEFT JOIN ( SELECT T3.STREET_NAME AS quyu,COUNT(DISTINCT T1.FIREID) AS jdNum FROM V_SX_FIRESAFETYPLAN T1 LEFT JOIN V_FIRESAFETYREGISTER_DYC T2 ON T1.FIREID = T2.ID LEFT JOIN V_HSE_COMB_BUILDING_INFO_PA T3 ON LEFT(T2.HOUSEID,19) = T3.BUILDING_CODE WHERE T1.DATE_NEW IS NOT NULL and date_format(T1.DATE_NEW,'%Y') = ? GROUP BY T3.STREET_NAME ) T3 ON T1.quyu = T3.quyu LEFT JOIN ( SELECT T3.STREET_NAME AS quyu,COUNT(*) as xcNum FROM V_SX_FIRESAFETYTRAINING T1 LEFT JOIN V_FIRESAFETYREGISTER_DYC T2 ON T1.FIREID = T2.ID LEFT JOIN V_HSE_COMB_BUILDING_INFO_PA T3 ON LEFT(T2.HOUSEID,19) = T3.BUILDING_CODE WHERE T1.TRAININGTIME IS NOT NULL and date_format(T1.TRAININGTIME,'%Y') = ? GROUP BY T3.STREET_NAME ) T4 ON T1.quyu = T4.quyu ORDER BY T2.lastNum limit ?,?
时间: 2024-03-15 11:45:31 浏览: 20
可以尝试以下优化:
1. 对于子查询中的表,添加合适的索引以提高查询效率;
2. 可以考虑将子查询改为临时表,避免多次重复查询;
3. 在需要排序的字段上添加索引;
4. 尽量避免在 JOIN 条件中使用函数,可以将日期比较条件提取到 WHERE 子句中。
优化后的 SQL 如下:
```
CREATE TEMPORARY TABLE tmp_street AS
SELECT STREET AS quyu FROM STREET_YXW WHERE 1=1 GROUP BY STREET;
CREATE TEMPORARY TABLE tmp_lastNum AS
SELECT T2.STREET_NAME AS quyu, COUNT(*) AS lastNum
FROM V_FIRESAFETYREGISTER_DYC T1
LEFT JOIN V_HSE_COMB_BUILDING_INFO_PA T2 ON LEFT(T1.HOUSEID, 19) = T2.BUILDING_CODE
WHERE T1.LASTLOGOUTTIME IS NOT NULL AND date_format(T1.LASTLOGOUTTIME,'%Y') = ?
GROUP BY T2.STREET_NAME;
CREATE TEMPORARY TABLE tmp_jdNum AS
SELECT T3.STREET_NAME AS quyu, COUNT(DISTINCT T1.FIREID) AS jdNum
FROM V_SX_FIRESAFETYPLAN T1
LEFT JOIN V_FIRESAFETYREGISTER_DYC T2 ON T1.FIREID = T2.ID
LEFT JOIN V_HSE_COMB_BUILDING_INFO_PA T3 ON LEFT(T2.HOUSEID, 19) = T3.BUILDING_CODE
WHERE T1.DATE_NEW IS NOT NULL AND date_format(T1.DATE_NEW,'%Y') = ?
GROUP BY T3.STREET_NAME;
CREATE TEMPORARY TABLE tmp_xcNum AS
SELECT T3.STREET_NAME AS quyu, COUNT(*) AS xcNum
FROM V_SX_FIRESAFETYTRAINING T1
LEFT JOIN V_FIRESAFETYREGISTER_DYC T2 ON T1.FIREID = T2.ID
LEFT JOIN V_HSE_COMB_BUILDING_INFO_PA T3 ON LEFT(T2.HOUSEID, 19) = T3.BUILDING_CODE
WHERE T1.TRAININGTIME IS NOT NULL AND date_format(T1.TRAININGTIME,'%Y') = ?
GROUP BY T3.STREET_NAME;
SELECT T1.quyu, T2.lastNum, T3.jdNum, T4.xcNum
FROM tmp_street T1
LEFT JOIN tmp_lastNum T2 ON T1.quyu = T2.quyu
LEFT JOIN tmp_jdNum T3 ON T1.quyu = T3.quyu
LEFT JOIN tmp_xcNum T4 ON T1.quyu = T4.quyu
ORDER BY T2.lastNum
LIMIT ?,?;
```
请注意,这只是一种可能的优化方案,具体的优化方法还要根据数据库的实际情况进行调整。