1、保留两位小数
Round(rent_income/10000,2) rent_income,
2、where 条件
where m1.is_deleted = 0
-- 物料编号/名称/入库单号/入库仓库
and (
m3.material_no like CONCAT('%','1','%')
or m3.material_name like CONCAT('%','1','%')
or m1.stock_in_single_no like CONCAT('%','1','%')
or m4.warehouse_name like CONCAT('%','1','%')
)
and m1.project_id in ( 322,323 )
and m1.audit_status = 1003
and date_format(m1.stock_in_time, '%Y-%m-%d') > '2022-04-29'
and date_format(m1.stock_in_time, '%Y-%m-%d') < '2022-08-29'
3、日期相减
DATEDIFF(cont_real_end_date,cont_begin_date)
4、最大值
select max(submit_time) from asset_operating_fixed
where is_deleted = 0 and project_id = pm.id
and date_format( submit_time, '%Y-%m' ) <= date_format( NOW(), '%Y-%m' )
5、if语句
IF(mom.month_profit = NULL,NULL,(hb.month_profit - mom.month_profit)/mom.month_profit) as month_profit_mom,
GROUP BY m1.id
6、指定数据库
-- and table_schema = 'amp_xinjin'
7、查询表的所有字段名称 各种拼接
-- column_comment COLUMN_NAME
-- "id":"自增id",
-- select GROUP_CONCAT('"' ,COLUMN_NAME ,'":"',column_comment,'"') from information_schema.COLUMNS
-- where table_name = 'project_format_records' ;
-- "id","project_id",
-- select GROUP_CONCAT('"',COLUMN_NAME,'"' ) result from information_schema.COLUMNS
-- where table_name = 'project_format_records' ;
-- id,project_id,
select GROUP_CONCAT('' ,COLUMN_NAME ,'') from information_schema.COLUMNS
where table_name = 'project_format_records' ;
8、xml里面的小于号
<!CDATA\[ \< ]>
<