Mysql中常用雙表批量更新

1、UPDATE 表1 a, 表2 b SET a.字段1 = b.字段1, a.字段2 = b.字段2 WHERE 條件1
例：

update income_invoice_profit_center a,income_invoice_collection o
        set a.profit_center_id = o.profit_center_id,a.profit_center_name=o.profit_center_name
        where a.invoice_code=o.invoice_code and a.invoice_num=o.invoice_num and
        a.profit_center_id is null

2、if(exp,值1，值2)

SELECT
		DISTINCT t1.id,
		t1.main_id,
		t1.name,
		if(t2.id is null,0,1) finish -- '1處理，0未處理'
		from tax_partner t1
		left join tax_declaration_report_partner t2
		on t1.id =t2.partner_id
		and t2.main_id=#{mainId} and t2.`month`=#{authMonth}