查詢的時候，可以使用表的別名

可以把一個，或者多個查詢的結果，起一個別名
當作一個表，接著進行其他查詢操作

Mapper

List<AnnualPlanExt> selectExtPagedList(Page<AnnualPlanExt> page, HashMap<String, Object> map);

Mapper.xml

<select id="selectExtPagedList" parameterType="hashMap" resultMap="BaseResultMapExt"> SELECT A.*,B.NAME LABORATORY_NAME,C.TEST_OBJECT_NAME TEST_OBJECT_NAME ,D.CUST_NAME CUSTOMER_NAME, E.CUST_NAME TESTED_UNIT_NAME FROM (select<if test="distinct">distinct</if><include refid="Base_Column_List" />from BIZ_ANNUAL_PLAN<if test="_parameter != null"><include refid="Example_Where_Clause" /></if><if test="orderByClause != null">order by ${orderByClause}</if><if test="start != null and end !=null ">limit #{start} , #{end}</if> ) ALEFT JOIN ( SELECT ID,NAME FROM RES_LABORATORY <if test="laboratoryId != null"> WHERE ID = #{laboratoryId} </if> ) B ON A.LABORATORY_ID = B.IDLEFT JOIN ( SELECT ID,TEST_OBJECT_NAME FROM DIC_TEST_OBJECT <if test="testObjectId != null">WHERE ID = #{testObjectId} </if> ) C ON A.TEST_OBJECT_ID = C.IDLEFT JOIN ( SELECT ID,CUST_NAME FROM V_CRM_CUSTOMER <if test="customerId != null">WHERE ID = #{customerId} </if> ) D ON A.CUSTOMER_ID = D.IDLEFT JOIN ( SELECT ID,CUST_NAME FROM V_CRM_CUSTOMER <if test="testedUnitId != null">WHERE ID = #{testedUnitId} </if> ) E ON A.TESTED_UNIT_ID = E.ID </select>

總結

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