SQL SQL語句積累

實際案例

例：結果集中，name=胡聰 age=23 性別=男，想要輸出diy欄位

select su.name ,su.age ,su.*** , concat('姓名', su.name,'年齡'，su.age, '性別'，su.***) as memo

from sys_user

name

age***

memo

胡聰23

男姓名胡聰年齡23性別男

sql round() 語法:select round(column_name,decimals) from table_name

column_name：需要四捨五入的欄位名 decimals:保留的小數字數

需求：需要統計指定時間內，榜單材料的重量佔比，並按高低進行排序

思路：按材料名稱進行分組，統計出每種材料的總重量，再除以材料總的重量

sql:子查詢作為結果、round（）函式、分組group by、排序order by、字串拼接concat()

select

a.materialdetailname,
a.realweight,
concat( round( a.realweight / b.totalrealweight * 100, 2 ), '', '%' ) as percent 
from
(select
bbd.material_name as materialdetailname,
ifnull( sum( bbd.real_weight ), 0 ) as realweight 
from
bi_bill_detail bbd
left join bi_bill bb on bb.id = bbd.bill_id 
where
1 = 1 
and bb.del_flag = 0 
and bbd.material_name is not null 
and bb.office_id in ( 033 ) 
and bb.in_date >= '2020-01-01 00:00:00' 
and bb.in_date <= '2020-12-31 23:59:59' 
group by
bbd.material_name 
order by
realweight desc 
) as a,
(select
ifnull( sum( bbd.real_weight ), 0 ) as totalrealweight 
from
bi_bill_detail bbd
left join bi_bill bb on bb.id = bbd.bill_id 
where
1 = 1 
and bb.del_flag = 0 
and bbd.material_name is not null 
and bb.office_id in ( 033 ) 
and bb.in_date >= '2020-01-01 00:00:00' 
and bb.in_date <= '2020-12-31 23:59:59' 
) as b

materialdetailname

realweight

percent

道砟1380.911

32.89%

機制砂1062.64

25.31%

碎石1010.375

24.06%

ab料485.24

11.56%

水泥208.06

4.95%

鋼絞線32.02

0.76%

柴油19.86

0.47%

參考：

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