${if(e==0,"select t3.office_name,t1.total_spec_gene_rate `今年`,t2.total_spec_gene_rate `去年`,t1.freight_yoy `同比`from (select distinct office_code,office_name from freight_sales_amount_rate_analyze_day) t3 left join(SELECT data_day,office_name,office_code,ifnull(total_spec_gene_rate,0) total_spec_gene_rate,ifnull(freight_yoy,0)-1 as `freight_yoy`FROM `freight_sales_amount_rate_analyze_day` where "+if(len(a)=0,'1=1',' distribution_center_name = '+a+'')+"and data_day = '"+b+"' group by office_name,office_code) t1 on t1.office_code=t3.office_code left join(SELECT data_day,office_name,office_code,ifnull(total_spec_gene_rate,0) total_spec_gene_rateFROM `freight_sales_amount_rate_analyze_day` where "+if(len(a)=0,'1=1',' distribution_center_name = '+a+'')+"and data_day = date_sub('"+b+"' ,interval 1 year)group by office_name,office_code) t2 on t2.office_code=t3.office_code","")}在${if()}里面怎么使用if函数现在这么写报错