Question

我是sql的新手，我需要你的帮助。非常感谢你的时间！

Locprog表列出了在不同位置启动程序的日期（每个位置由唯一的指示符LOC标识）

LOC PROG DATE_STARTED   
121   P     10-JUL-95
131   P     11-JUL-95
141   P     18-APR-00
151   P     19-APR-00
161   P     26-MAY-06
171   P     28-MAY-06
181   P     30-APR-15
191   P     31-APR-15
192   P     19-JAN-16
195   P     20-JAN-16

DTWK表格给出了与特定日期相关的周数

D_IND       W_IND
09-JUL-95   199501
10-JUL-95   199502
11-JUL-95   199502
12-JUL-95   199502
13-JUL-95   199502
14-JUL-95   199502
15-JUL-95   199502
16-JUL-95   199502
17-JUL-95   199502
...        ...
18-APR-00   200005
19-APR-00   200005
26-MAY-06   200602
28-MAY-06   200602
30-APR-15   201504
31-APR-15   201504
19-JAN-16   201603
20-JAN-16   201603

问题：我想在200602和201603周之间找到该计划有效的地点数

我试过了

 select count(*) from (
 select distinct A.LOC, A.Date_started, B.w_ind as wk from Locprog A, DTWK B 
 where a.date_started=B.d_ind) aa
 where aa.wk<=200602

答案：6

我试图在＆lt; =运算符之后包含周范围（200602和201603）并且然后按所需范围的w_id

 select count(*), bb.wek from (
  select distinct A.LOC, A.Date_started, B.w_ind as wk from Locprog A, DTWK B 
  where a.date_started=B.d_ind) aa
  where aa.wk<= ( select distinct W_ind as wek fromDTWK where W_ind between 200602 and 201603) bb
   group by bb.wk
   order by bb.wk

查询不起作用。你能帮忙吗？谢谢！

所需的输出

 wk       count
 200602    6
 201504    8    
 201603   10

Answer 1

SELECT COUNT(DISTINCT lp.loc)
FROM LogProg lp JOIN DTWK dw on lp.date_started = dw.d_ind
WHERE dw.w_ind >= 200602
AND dw.w_ind <= 201603;

Answer 2

DTWK表每周的编号都有很多记录以下查询给出了每周数字的开始和结束日期：

SELECT min( D_IND ) start_date,
       max( D_IND ) end_date
FROM DTWK d
WHERE d.W_IND between 200602 and 201603
GROUP BY W_IND

并且可以将此查询的结果连接到LOC表以计算计数：

SELECT count( distinct loc )
FROM LOC l
JOIN (
    SELECT min( D_IND ) start_date,
           max( D_IND ) end_date
    FROM DTWK d
    WHERE d.W_IND between 200602 and 201603
    GROUP BY W_IND
) x
ON l.date_started between x.start_date and x.end_date
;

演示：http://sqlfiddle.com/#!15/a08af/6

SQL QUERY - 使用＆lt; =运算符的值范围

2 个答案: