SQL语句汇总

1.查询出来数据保留小数点2位，并且0.01时候，不会展示为.01。

select     to_char(0.1,'fm9999999990.00') from dual;

2.wm_concat  多行转一行

select orders,name||weight||unit||'*'||quantity as info from XX_ORDER_ITEM
WHERE ORDERS ='160622095600076'

转成1行

select t.orders,TO_CHAR(wm_concat(t.info)) as infos from
(select orders,name||weight||unit||'*'||quantity as info from XX_ORDER_ITEM
WHERE ORDERS ='160622095600076')t
group by t.orders