我使用的软件将只允许我进入的地方.SQL语句的部分。然而,SELECT DISTINCT Left([PR].[WBS1],5)&"-000" AS WBS1GROUP BY Left([PR].[WBS1],5), Right([PR].[WBS1],3), PR.Status
HAVING ((Right(PR.WBS1,3)<>
16 17 187 8 9 10 11 12第一行中的计算-一次只考虑两个矩阵中的四个元素(0表示填充):
(1-8)+(2-9)+(3-10)+(4-(2-9)+(3-10)+(4-11)+(5-12): This replaces 2 in initial matrix.(3-10)+(4-11)+(5-12)+(6-0): This replaces 3 in initial matrix.(4-11)+(5-12)+(6-0)+(0-0): This replac
我将一个旧软件(使用MS-ACCESS MDB)转换为mySQL。我有一个查询需要很长时间才能运行(实际上,我在等待5分钟后就中断了运行),我该如何编写它?SELECT pa_ID, pa_PRODUCT_ID, pr_ID,pr_NAME,Sum(pa_KILOS) as IN_KILOS,
(select sum(pl_KILOS) fromPOLHSH.pl_PARALABH_ID = pa_ID) as OUT_KILOS From PARALABH, PRODUCTS WHERE pa_company_id=1 GROU