sql查詢每個月的資料並自動補零
阿新 • • 發佈：2019-01-31
使用sql查詢，對每個月的資料進行查詢並進行統計，當該月資料為零時進行補零操作。
首先先從表qm_technical_zero中對每個月的資料進行查詢
SELECT COUNT(*) as con , CONCAT(YEAR(applicationdate),'-',MONTH(applicationdate)) as mon FROM `qm_technical_zero` GROUP BY mon查詢結果如下所示
從查詢結果我們可以看出2018年4月9月10月11月12月的資料都是為零的，但是卻沒有顯示。因此我們需要將資料進行補零處理。
我們需要建立一個有當年所有月份的表，建表過程如下
SELECT STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d') as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 1 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 2 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 3 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 4 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 5 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 6 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 7 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 8 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 9 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 10 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 11 MONTH) as click_date
通過建表我們可以得到如下所示的表，包含了當前年份的所有月份
然後我們再對這兩張表進行聯合查詢
SELECT CONCAT(YEAR(click_date),'-',MONTH(click_date)) as m,IFNULL(b.con,0) as c FROM(SELECT STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d') as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 1 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 2 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 3 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 4 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 5 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 6 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 7 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 8 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 9 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 10 MONTH) as click_date UNION ALL SELECT DATE_ADD(STR_TO_DATE(CONCAT(YEAR(CURDATE()),'-',1,'-',1) , '%Y-%m-%d'),INTERVAL 11 MONTH) as click_date) a LEFT JOIN( SELECT COUNT(*) as con , CONCAT(YEAR(applicationdate),'-',MONTH(applicationdate)) as mon FROM `qm_technical_zero` GROUP BY mon) b ON CONCAT(YEAR(click_date),'-',MONTH(click_date))=b.mon
聯合查詢的結果如下所示
從結果中我們可以看出，經過聯合查詢之後，對4月、9月等資料為零的月份進行了補零操作。