Navicat 11.0.10版本结果证明表关联比子查询速度更快1.子查询:0.287sSELECT sw,sh,cx,cy,(SELECT buy_url FROM b_product WHERE single_file_id sys_item_id AND deleted 0) AS buy_url,(SELECT discount_price FROM b_product WHERE single_file_id sys_item_i…
1.Add a login user and group for mysqld‘ to run as:为‘mysqld’增添一个登陆用户和组shell groupadd mysqlshell useradd -g mysql mysql2.解压shell gunzip mysql-5.0.15.tar.gz tar -xvf -shell cd mysql-5.0.153.Configure the release and compile everything:配置和编…