改變查詢返回的行不匹配

Question

SELECT 
    T.clinic_code, C.dt, T.schedule_time, T.section_name, 
    T.section_content, CS.schedule_event_source_id 
FROM Master_Templates T 
    INNER JOIN Calendar C 
    ON T.dw = C.dw 
    AND T.mo = (C.D - 1)/7 + 1 
    AND C.Y = '2014' 
    AND C.M = '3' 
    AND T.clinic_code = 'ABC' 
    LEFT OUTER JOIN Clinic_Schedule CS 
    ON CS.schedule_date=convert(varchar, C.dt, 121) 
    AND CS.clinic_code=T.clinic_code 
    AND CS.schedule_time=T.schedule_time 
    AND CS.section_name = T.section_name 
    WHERE CS.schedule_event_source_id = 2 

Clinic_Schedule包含1個記錄：

clinic_code | schedule_date | schedule_time | section_name | schedule_event_source_id ABC | 2014-03-03 | AM |教師| 2

Master_Template包含168個記錄：

clinic_code | dw | mo | schedule_time | section_name | section_content

日曆包含列以加入Master_Template記錄與星期幾。

如何更改上面的查詢以返回167行？即master_template中的總行數減去clinic_schedule中的行數。

Answer 1

這個怎麼樣：

SELECT 
    T.clinic_code, C.dt, T.schedule_time, T.section_name, 
    T.section_content, CS.schedule_event_source_id 
FROM Master_Templates T 
    INNER JOIN Calendar C 
    ON T.dw = C.dw 
    AND T.mo = (C.D - 1)/7 + 1 
    AND C.Y = '2014' 
    AND C.M = '3' 
    AND T.clinic_code = 'ABC' 
    LEFT OUTER JOIN Clinic_Schedule CS 
    ON CS.schedule_date=convert(varchar, C.dt, 121) 
    AND CS.clinic_code=T.clinic_code 
    AND CS.schedule_time=T.schedule_time 
    AND CS.section_name = T.section_name 
    AND CS.schedule_event_source_id = 2 
    WHERE CS.clinic_code IS NULL 

？

Answer 2

只返回從T中的記載，沒有在CS比賽，你可以使用HAVING，這是類似WHERE但對JOIN的結果適用條件：

SELECT 
    T.clinic_code, C.dt, T.schedule_time, T.section_name, 
    T.section_content, CS.schedule_event_source_id 
FROM Master_Templates T 
INNER JOIN Calendar C 
    ON T.dw = C.dw 
    AND T.mo = (C.D - 1)/7 + 1 
    AND C.Y = '2014' 
    AND C.M = '3' 
    AND T.clinic_code = 'ABC' 
LEFT OUTER JOIN Clinic_Schedule CS 
    ON CS.schedule_date=convert(varchar, C.dt, 121) 
    AND CS.clinic_code=T.clinic_code 
    AND CS.schedule_time=T.schedule_time 
    AND CS.section_name = T.section_name 
    AND CS.schedule_event_source_id = 2 
HAVING CS.clinic_code IS NULL