left join 左聯表 where條件查詢時
<if test="status != null and status != ''"> and status = #{status}</if>
沒有聲明是哪一個表，兩表均有status字段
報錯Column 'status' in where clause is ambiguous
解決方案：查詢多張表時給每張表取名，表名.字段來表示
免責聲明！
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