我有以下代码，它将两个select语句合并在一起，但是第二个select从select 2开始。
select tax_type, sum(amount) from bill_tax_tbl a (index multi), bill_summ_tbl b where a.customer_no = @customer_no and a.invoice_month = convert(tinyint,datepart(mm,dateadd(mm,-1,convert(datetime,@date)))) and a.job = b.job and a.billing_sub_job = b.billing_sub_job and b.job_group is null group by tax_type union select 2, sum(amount) from bill_tax_tbl a (index multi), bill_summ_tbl b where a.customer_no = @customer_no and tax_type = 1 and a.invoice_month = convert(tinyint,datepart(mm,dateadd(mm,-1,convert(datetime,@date)))) and a.job = b.job and a.billing_sub_job = b.billing_sub_job and b.job_group is null
2是将在tax_type字段中结束的值常量。
给定表的示例：
+-----+-----+
| a | b |
+===========+
| 'a' | 'b' |
| 'c' | 'd' |
+------------
查询者：
SELECT a, b from table
UNION
SELECT 'y','z'
将返回：
+-----+-----+
| a | b |
+===========+
| 'a' | 'b' |
| 'c' | 'd' |
| 'y' | 'z' |
+------------
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我来说两句