merge into 
table_a a 
using 
table_b b 
on(a.id=b.id)
when 
not matched 
then 
insert(a.id,a.col,a.col2.....) values(b.id,b.col,b.col2.......)

列子：（mybatis中的xml）

入參：物件

表b根據入參建立，然後判斷表b跟表a的主鍵是否衝突，不衝突則插入

<insert id="ignoreSelective" databaseId="oracle" parameterType="com.synjones.cloudcard.attence.infra.entity.AttenceTempWorkEntity" >
        merge into 
        attence_temp_work a 
        using 
        (select 
	        #{custMemberId,jdbcType=CHAR} CUST_MEMBER_ID,
	        #{date,jdbcType=CHAR} "DATE",
	        #{custId,jdbcType=CHAR} CUST_ID,
	        #{workTimeId,jdbcType=INTEGER} WORK_TIME_ID,
	        #{workNature,jdbcType=CHAR} WORK_NATURE,
	        #{overWorkFlag,jdbcType=CHAR} OVER_WORK_FLAG,
	        #{overWorkTime,jdbcType=INTEGER} OVER_WORK_TIME,
	        #{createdOperCode,jdbcType=CHAR} CREATED_OPER_CODE,
	        #{createdStamp,jdbcType=TIMESTAMP} CREATED_STAMP,
	        #{lastUpdatedStamp,jdbcType=TIMESTAMP} LAST_UPDATED_STAMP,
	        #{lastUpdatedOperCode,jdbcType=CHAR} LAST_UPDATED_OPER_CODE,
	        #{workAroundId,jdbcType=INTEGER} WORK_AROUND_ID
	          from dual
	        
        ) b 
        on(a.CUST_MEMBER_ID=b.CUST_MEMBER_ID and a."DATE"=b."DATE")
		when not matched 
		then 
		insert 
        <trim prefix="(" suffix=")" suffixOverrides="," >
            <if test="custMemberId != null" >
                a.cust_member_id,
            </if>
            <if test="date != null" >
                a."DATE",
            </if>
            <if test="custId != null" >
                a.cust_id,
            </if>
            <if test="workTimeId != null" >
                a.work_time_id,
            </if>
            <if test="workNature != null" >
                a.work_nature,
            </if>
            <if test="overWorkFlag != null" >
                a.over_work_flag,
            </if>
            <if test="overWorkTime != null" >
                a.over_work_time,
            </if>
            <if test="createdOperCode != null" >
                a.created_oper_code,
            </if>
            <if test="createdStamp != null" >
                a.created_stamp,
            </if>
            <if test="lastUpdatedStamp != null" >
                a.last_updated_stamp,
            </if>
            <if test="lastUpdatedOperCode != null" >
                a.last_updated_oper_code,
            </if>
            <if test="workAroundId != null" >
                a.work_around_id,
            </if>
        </trim>
        <trim prefix="VALUES (" suffix=")" suffixOverrides="," >
            <if test="custMemberId != null" >
                #{custMemberId,jdbcType=CHAR},
            </if>
            <if test="date != null" >
                #{date,jdbcType=CHAR},
            </if>
            <if test="custId != null" >
                #{custId,jdbcType=CHAR},
            </if>
            <if test="workTimeId != null" >
                #{workTimeId,jdbcType=INTEGER},
            </if>
            <if test="workNature != null" >
                #{workNature,jdbcType=CHAR},
            </if>
            <if test="overWorkFlag != null" >
                #{overWorkFlag,jdbcType=CHAR},
            </if>
            <if test="overWorkTime != null" >
                #{overWorkTime,jdbcType=INTEGER},
            </if>
            <if test="createdOperCode != null" >
                #{createdOperCode,jdbcType=CHAR},
            </if>
            <if test="createdStamp != null" >
                #{createdStamp,jdbcType=TIMESTAMP},
            </if>
            <if test="lastUpdatedStamp != null" >
                #{lastUpdatedStamp,jdbcType=TIMESTAMP},
            </if>
            <if test="lastUpdatedOperCode != null" >
                #{lastUpdatedOperCode,jdbcType=CHAR},
            </if>
            <if test="workAroundId != null" >
                #{workAroundId,jdbcType=INTEGER},
            </if>
        </trim>

    </insert>