mysql - 尝试连接 3 个语句

Question

SELECT       INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE  (INS_PRODUCT = 'Mobl Hlth') AND (CREATED BETWEEN '10/1/2014' AND '09/30/2015') and (SR_AREA IS NOT NULL)    
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD
ORDER BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

SELECT       INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE  (INS_PRODUCT = 'MHV') AND (CREATED BETWEEN '10/1/2014' AND '09/30/2015') and (SR_AREA IS NOT NULL)    
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD
ORDER BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

SELECT       INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE  (INS_PRODUCT = 'eBenefits') AND (CREATED BETWEEN '10/1/2014' AND '09/30/2015') and (SR_AREA IS NOT NULL)    
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD
ORDER BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

每个代码都提取我需要的不同信息

Answer 1

您可以将 WHERE 子句组合在一起:

SELECT INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE SR_AREA IS NOT NULL
AND CREATED BETWEEN '10/1/2014' AND '09/30/2015'
AND INS_PRODUCT IN ('Mobl Hlth', 'MHV', 'eBenefits')
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD
ORDER BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

<小时/>

或者你可以将它们结合在一起:

SELECT INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE  (INS_PRODUCT = 'Mobl Hlth') AND (CREATED BETWEEN '10/1/2014' AND '09/30/2015') and (SR_AREA IS NOT NULL)    
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

UNION ALL

SELECT INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE  (INS_PRODUCT = 'MHV') AND (CREATED BETWEEN '10/1/2014' AND '09/30/2015') and (SR_AREA IS NOT NULL)    
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

UNION ALL

SELECT INS_PRODUCT, SR_AREA, RESOLUTION_CD, COUNT(*) AS Vol        
FROM S_SRV_REQ          
WHERE  (INS_PRODUCT = 'eBenefits') AND (CREATED BETWEEN '10/1/2014' AND '09/30/2015') and (SR_AREA IS NOT NULL)    
GROUP BY INS_PRODUCT, SR_AREA, RESOLUTION_CD
ORDER BY INS_PRODUCT, SR_AREA, RESOLUTION_CD

有两件事需要注意:UNION ALL 当您知道您的记录不重叠时。这避免了数据库检查重复项。另外，只需在末尾放置一个 ORDER BY。