select substr(F_VDATE, 1, 4) as F_YEAR, substr(F_VDATE, 5, 2) as F_MONTH, substr(F_VDATE, 7, 2) as F_DAY, TONUM.DOCUMENTNUMBER as F_PZBH, F_JY, F_JF06 as F_JFJE, F_DF06 as F_DFJE, F_GSDMBH from PSDJZPZFL YETBL GLOBAL LEFT JOIN EFI_VOUCHERIDTONUM2023 TONUM on YETBL.F_PZBH = TONUM.VOUCHERID prewhere YETBL.F_VDATE='20230602' WHERE F_CLIENT = '10133' and F_UNITID in ('1800') and YETBL.F_CODE in ('00010001') and YETBL.F_FLZBH in ('0001') and YETBL.F_KMBH in ('0101') and YETBL.F_KMBH in ('0101') group by F_VDATE HAVING SUM(F_SIGN) > 0 order by F_DATE, F_PZBH desc;如何改进
时间: 2024-04-27 17:25:27 浏览: 5
根据您提供的 SQL 语句,我看到以下几个可以改进的地方:
1. 首先,您在 WHERE 子句中对 F_KMBH 进行了两次筛选,其中一次是多余的。建议只保留其中一个,以提高查询效率。
2. 其次,您在 SELECT 子句中使用了 substr 函数来提取日期中的年、月、日等信息。这种方式会影响查询效率,建议改用 DATE 函数来提取日期信息,例如:SELECT DATE(F_VDATE) AS F_DATE, TONUM.DOCUMENTNUMBER AS F_PZBH, ...
3. 此外,您在 FROM 子句中使用了 PSDJZPZFL 表和 GLOBAL 表,但是没有给出它们之间的连接条件。因此,这个查询可能会产生笛卡尔积,导致查询结果出现错误或者效率低下。建议您根据实际情况,添加正确的连接条件。
4. 最后,您在 WHERE 子句中对 F_CLIENT 和 F_UNITID 进行了筛选,但是没有给出这些字段的数据类型。如果这些字段是数值类型,建议将它们的值用数字表示,以提高查询效率。
综上所述,根据您的实际情况,可以对 SQL 语句进行如下改进:
SELECT DATE(F_VDATE) AS F_DATE,
TONUM.DOCUMENTNUMBER AS F_PZBH,
F_JY,
F_JF06 AS F_JFJE,
F_DF06 AS F_DFJE,
F_GSDMBH
FROM PSDJZPZFL YETBL
LEFT JOIN EFI_VOUCHERIDTONUM2023 TONUM
ON YETBL.F_PZBH = TONUM.VOUCHERID
WHERE YETBL.F_VDATE = '20230602'
AND F_CLIENT = 10133
AND F_UNITID = 1800
AND YETBL.F_CODE = '00010001'
AND YETBL.F_FLZBH = '0001'
AND YETBL.F_KMBH = '0101'
GROUP BY F_DATE, F_PZBH
HAVING SUM(F_SIGN) > 0
ORDER BY F_DATE, F_PZBH DESC;