sql多列加上每列的總和

Question

使用MySQL，我計算了幾年時間跨度內發生的幾個事件（字段）。然後，我會逐年按欄顯示。按年份分組時，我的查詢功能非常完美。我現在想添加一個顯示年份總和的最後一列。我如何在列中查詢列？

Event 2008 2009 2010 2011 total 
    A  0  2 0  1  3 
    B  1  2 3  0  6 
etc. 

這裏是真正的查詢：

select 
    count(*) as total_docs, 
    YEAR(field_document_date_value) as doc_year, 
    field_document_facility_id_value as facility, 
    IF(count(IF(field_document_type_value ='LIC809',1, NULL)) >0,count(IF(field_document_type_value ='LIC809',1, NULL)),'-') as doc_type_LIC809, 
    IF(count(IF(field_document_type_value ='LIC9099',1, NULL)) >0,count(IF(field_document_type_value ='LIC9099',1, NULL)),'-') as doc_type_LIC9099, 
    IF(count(field_document_f1_value) >0,count(field_document_f1_value),'-') as substantial_compliance, 
    IF(count(field_document_f2_value) >0,count(field_document_f2_value),'-') as deficiencies_sited, 
    IF(count(field_document_f3_value) >0,count(field_document_f3_value),'-') as admin_outcome_809, 
    IF(count(field_document_f4_value) >0,count(field_document_f4_value),'-') as unfounded, 
    IF(count(field_document_f5_value) >0,count(field_document_f5_value),'-') as substantiated, 
    IF(count(field_document_f6_value) >0,count(field_document_f6_value),'-') as inconclusive, 
    IF(count(field_document_f7_value) >0,count(field_document_f7_value),'-') as further_investigation, 
    IF(count(field_document_f8_value) >0,count(field_document_f8_value),'-') as admin_outcome_9099, 
    IF(count(field_document_type_a_value) >0,count(field_document_type_a_value),'-') as penalty_type_a, 
    IF(count(field_document_type_b_value) >0,count(field_document_type_b_value),'-') as penalty_type_b, 
    IF(sum(field_document_civil_penalties_value) >0,CONCAT('$',sum(field_document_civil_penalties_value)),'-') as total_penalties, 
    IF(count(field_document_noncompliance_value) >0,count(field_document_noncompliance_value),'-') as total_noncompliance 

from rcfe_content_type_facility_document 

where YEAR(field_document_date_value) BETWEEN year(NOW()) -9 AND year(NOW()) 
    and field_document_facility_id_value = :facility 

group by doc_year 

Answer 1

你不能GROUP連續兩次在SELECT，所以你只能在一年中總計算行。你可以UNION兩個SELECT（一個按年份分組，一個分組 - 總計）來克服這個限制，但我認爲如果有的話，最好從年份結果中統計總數。

簡單的例子：

SELECT by_year.amount, years.date_year FROM 

-- generating years pseudo table 
(
    SELECT 2008 AS date_year 
    UNION ALL SELECT 2009 
    UNION ALL SELECT 2010 
    UNION ALL SELECT 2011 
) AS years 

-- joining with yearly stat data 
LEFT JOIN 
(
    SELECT SUM(value_field) AS amount, YEAR(date_field) AS date_year FROM data 
    GROUP BY YEAR(date_field) 
) AS by_year USING(date_year) 

-- appending total 
UNION ALL SELECT SUM(value_field) AS amount, 'total' AS date_year FROM data 

Answer 2

WITH ROLLUP是你的朋友： http://dev.mysql.com/doc/refman/5.7/en/group-by-modifiers.html

使用原來的查詢，並只需添加這到最後一行：

GROUP BY doc_year WITH ROLLUP 

這會將最後一個累積行添加到查詢的結果集中。