sql查詢每個月的資料並自動補零

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

查詢結果如下所示

從查詢結果我們可以看出2023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。

我們需要建立乙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

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(
b on concat(year(click_date),'-',month(click_date))=b.mon

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。

參考部落格：

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