delphi sql中加like 写法

'FROM (SELECT hetongbianhao, zhiwu, xingming, shigongfenlei,'+
                          'SUM(shuliang) 设备数量, SUM(yingtichenge) 应提成额 '+
                          'FROM Y_shigongpaigong where zhiwu=''监理'' AND xingming like ''%''+'''+Trim(ComboBox_xingming.Text)+'''+''%''    '+