最近使用finereport做報表，涉及到好多sql的處理，下面是用到的sql的總結，sql有好多東西都是沒用過的。
1. if
表示式：if( expr1 , expr2 , expr3 )
expr1條件，條件為true，則值是expr2 ，false，值就是expr3
示例：
if(len(buyer)==0,"","and od.buyer_customer_name ='"+buyer+"'")case when
case 列名
when 條件 then 結果
else 其它結果
end 別名
示例：
case od.`status`
when
'05'
then
'已成交'
when
'10'
then
'已租船'
when
'15'
then
'已裝船'
when
'20'
then
'已到港'
when
'25'
then
'已卸貨'
when
'30'
then
'已對賬'
when
'35'
then
'已收款'
when
'00'
then
'已取消'
end as "狀態"
ifnull
ifnull( expr1 , expr2 )
在 expr1 的值不為 null的情況下都返回 expr1，否則返回 expr2
示例：
concat('$',ifnull((select format(max(statement.settlement_price), 3) from t_order_statement statement where od.id = statement.order_id and statement.statement_type = '2'
and statement.alive_flag = '1'),
(select format(max(statement.settlement_price), 3) from t_order_statement statement where od.id = statement.order_id and statement.statement_type = '1'
and statement.alive_flag = '1'))) as "結算**",
concat
示例：
concat(
'+/-',
format(goods.more_less, 0),
'%') as
"溢短裝",
concat(
transport.delivery_date_start,
'至',
transport.delivery_date_end
) as "裝期",
片段示例：
select channelname,browsemonth,
case
when @coltotal = oriinfo.browseweek then
@colnum
when @coltotal := oriinfo.browseweek then
@colnum :=@colnum + 1
when @coltotal = 0
then
@colnum :=@colnum + 1
endas monthorder
from
(select @colnum := 0 ,@coltotal := null)t,
本月第一天，最後一天
函式：
select curdate();
--獲取當前日期
select last_day(curdate());
--獲取當月最後一天。
select date_add(curdate(),interval -day(curdate())+1
day);
--獲取本月第一天
select date_add(curdate()-day(curdate())+1,interval
1month);
-- 獲取下個月的第一天
select datediff(date_add(curdate()-day(curdate())+1,interval
1month ),date_add(curdate(),interval -day(curdate())+1
day)) from dual;
--獲取當前月的天數
select ct.total as
"企業總數",cd.day
as"企業當天",cm.mon as
"企業當月"
from
(select
count(distinct e.member_id) as total from
`enterprises` e where create_time > '2017-01-01'
and create_time < '2020-03-31'
andexists (select * from members m where m.id = member_id and m.`del_***` = false
and m.locked = false)
andexists (select * from
`member_credentials` c where c.`member_id`= e.member_id and c.`credentials_code`='99'
and c.`audit`)) ct,
(select
count(*) as
dayfrom
`enterprises`
where create_time = curdate()) cd,
(select
count(*) as mon from
`enterprises`
where create_time >=
date_add(curdate(),interval -day(curdate())+1
day) and create_time <=
last_day(curdate())) cm;
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