请指出这段代码的错误：select emp_cd -- 顾问编码 ,data_dt -- 日期 ,tch_amt -- 教学品金额 from ( select shop_cd ,emp_cd ,replace(to_date(pay_tm),'-','') as data_dt ,sum(prod_pay_amt) as tch_amt from dw.d_ka_ss_tpsc_order_product_dtl op -- 门店订单产品明细表 inner join dw.dim_ka_pub_product_master_data pmd -- 产品主数据表 on op.product_cd = pmd.product_cd where pmd.sec_tch_typ='教学品' union all -- 后面这部分也是没看懂 select shop_cd ,emp_cd ,data_dt sum(correct_comb_amt) as tch_amt from dw.s_ka_ss_shop_emp_prod_d_mild pdm inner join dw.dim_ka_pub_product_master_data pmd on pdm.product_cd = pmd.product_cd where pmd.sec_tch_typ='教学品' ) t group by emp_cd ,data_dt

这段代码的错误是在第二个子查询中缺少一个逗号，应该是：select shop_cd ,emp_cd ,data_dt, sum(correct_comb_amt) as tch_amt from dw.s_ka_ss_shop_emp_prod_d_mild pdm inner join dw.dim_ka_pub_product_master_data pmd on pdm.product_cd = pmd.product_cd where pmd.sec_tch_typ='教学品'。

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阅读代码并分析代码含义：select emp_cd -- 顾问编码 ,data_dt -- 日期 ,tch_amt -- 教学品金额 from ( select shop_cd ,emp_cd ,replace(to_date(pay_tm),'-','') as data_dt ,sum(prod_pay_amt) as tch_amt from dw.d_ka_ss_tpsc_order_product_dtl op -- 门店订单产品明细表 inner join dw.dim_ka_pub_product_master_data pmd -- 产品主数据表 on op.product_cd = pmd.product_cd where pmd.sec_tch_typ='教学品' union all -- 后面这部分也是没看懂 select shop_cd ,emp_cd ,data_dt sum(correct_comb_amt) as tch_amt from dw.s_ka_ss_shop_emp_prod_d_mild pdm inner join dw.dim_ka_pub_product_master_data pmd on pdm.product_cd = pmd.product_cd where pmd.sec_tch_typ='教学品' ) t group by emp_cd ,data_dt

这段代码是查询顾问编码、日期和教学品金额。首先从门店订单产品明细表和产品主数据表中筛选出教学品的订单，然后将门店编码、顾问编码、日期和教学品金额汇总。接着从门店员工产品销售明细表和产品主数据表中筛选出教学品的销售记录，同样汇总门店编码、顾问编码、日期和教学品金额。最后将两个子查询的结果合并，并按照顾问编码和日期进行分组。