分组排序取最大sql理解

--用户过滤（只能看到当前用户对应部门用户权限表中的部门）
select h.pk_tbdept 
from jygyl_bmyhqxb h 
left join jygyl_bmyhqxb_b b 
on h.pk_bmyhqx = b.pk_bmyhqx 
where isnull(h.dr,0) = 0 
and isnull(b.dr,0) = 0 
and b.pk_user = '用户主键'--查询项目产值及回款填报各部门对应每个项目的最大月份的数据的合计
SELECT pk_dept as pk_dept,sum(nsrzbwcqk) as nsrzbwcqk
FROM (SELECT ROW_NUMBER () OVER (PARTITION BY xmczjhktb.project_code ORDER BY xmczjhktb.yearmth desc) as rank,xmczjhktb.*FROM (SELECT mon.yearmth,pro.project_code,dept.pk_dept,(select sum(yzbhsdnljwcnum) from jygyl_xmczjhktb_b b where b.pk_xmczjhktb = h.pk_xmczjhktb and isnull(h.dr,0) = 0 and isnull(b.dr,0) = 0 and csrcid IS NOT NULL AND LEN(csrcid) > 0) as nsrzbwcqkFROM jygyl_xmczjhktb hINNER JOIN bd_accperiodmonth mon ON h.tbyf = mon.pk_accperiodmonthINNER JOIN bd_project pro ON h.xmbh = pro.pk_projectINNER JOIN org_dept dept ON dept.pk_dept = pro.def2WHERE isnull(h.dr,0) = 0AND isnull(mon.dr,0) = 0AND isnull(pro.dr,0) = 0AND isnull(dept.dr,0) = 0AND h.vbillstatus = 1AND	mon.yearmth <='2024-05') xmczjhktb) h 
WHERE rank = 1
GROUP BY pk_dept--查询项目产值及回款填报各部门对应每个项目的最大月份的主表主键
SELECT pk_xmczjhktb
FROM (SELECT ROW_NUMBER () OVER (PARTITION BY xmczjhktb.project_code ORDER BY xmczjhktb.yearmth DESC) AS rank,xmczjhktb.*FROM(SELECT mon.yearmth,pro.project_code,dept.pk_dept,h.pk_xmczjhktbFROM jygyl_xmczjhktb hINNER JOIN bd_accperiodmonth mon ON h.tbyf = mon.pk_accperiodmonthINNER JOIN bd_project pro ON h.xmbh = pro.pk_projectINNER JOIN org_dept dept ON dept.pk_dept = pro.def2WHERE isnull(h.dr, 0) = 0AND isnull(mon.dr, 0) = 0AND isnull(pro.dr, 0) = 0AND isnull(dept.dr, 0) = 0AND h.vbillstatus = 1AND mon.yearmth <= '2024-05'  AND dept.pk_dept = '1001A1100000000000TG') xmczjhktb) h
WHERE rank = 1--查询部门新签合同维护各部门查询年份的最大月份数据
SELECT yearmth,tbdept,nxqzbwcqk
FROM(SELECT mon.yearmth,h.tbdept,(SELECT SUM (b.je) FROM jygyl_bmxqhtwh_b b WHERE b.pk_bmxqhtwh = h.pk_bmxqhtwh AND isnull(b.dr, 0) = 0) AS nxqzbwcqk,ROW_NUMBER () OVER (PARTITION BY h.tbdept ORDER BY mon.yearmth DESC) AS rownoFROM jygyl_bmxqhtwh hINNER JOIN bd_accperiodmonth mon ON h.tbmonth = mon.pk_accperiodmonthWHERE isnull(h.dr, 0) = 0AND h.vbillstatus = 1AND mon.yearmth >= '2024-01'AND mon.yearmth <= '2024-05') h
WHERE rowno = 1--查询部门新签合同维护该部门查询年份的最大月份的主表主键
SELECT pk_bmxqhtwh
FROM(SELECT mon.yearmth,h.tbdept,h.pk_bmxqhtwh,ROW_NUMBER () OVER (PARTITION BY h.tbdept ORDER BY mon.yearmth DESC) AS rownoFROM jygyl_bmxqhtwh hINNER JOIN bd_accperiodmonth mon ON h.tbmonth = mon.pk_accperiodmonthWHERE isnull(h.dr, 0) = 0AND h.vbillstatus = 1AND mon.yearmth >= '2024-01'AND mon.yearmth <= '2024-05') h
WHERE rowno = 1
AND tbdept = '1001A21000000008128D'--查询部门新签合同维护该部门查询年份的最大月份的主表主键
SELECT TOP 1 h.pk_bmxqhtwh
FROM jygyl_bmxqhtwh h
INNER JOIN bd_accperiodmonth mon ON h.tbmonth = mon.pk_accperiodmonth
WHERE isnull(h.dr, 0) = 0
AND isnull(mon.dr, 0) = 0
AND h.vbillstatus = 1
AND mon.yearmth >= '2024-01'
AND mon.yearmth <= '2024-05'
and tbdept = '1001A21000000008128D'
ORDER BY mon.yearmth DESC