mysql 中if(),left(),right(),with rollup的用法
if的用法: mysql> select if(10>9,10,9) as bigger from dual; +--------+ | bigger | +--------+ | 10 | +--------+ left()和right()的用法: mysql> select left(‘abcdeft‘,4) a,right(‘abcdeft‘,4) b; +------+------+ | a | b | +------+------+ | abcd | deft | +------+------+ with rollup的用法: select substr(tDeliverdate,1,10) riqi,sum(dSalesPrice) sale_amount from test.sale_order_detail group by riqi with rollup; +------------+-------------+ | riqi | sale_amount | +------------+-------------+ | 2014-12-31 | 0.300000 | | 2015-01-17 | 240.000000 | | NULL | 240.300000 | +------------+-------------+
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