mybatis的<choose>和<when>、<otherwise>标签

SELECT
<choose>
    <when test='timeType=="yy"'>
        TO_CHAR(REPORT_TIME,'yyyy')
    </when>
    <when test='timeType=="mm"'>
        TO_CHAR(REPORT_TIME,'yyyy-MM-dd')
    </when>
    <when test='timeType=="dd"'>
        TO_CHAR(REPORT_TIME,'yyyy-MM-dd')
    </when>
</choose>
RQ,
<choose>
    <when test='isAll != null and isAll == 1'>
        SUM(TOTAL)
    </when>
    <otherwise>
        SUM(GROW_TOTAL)
    </otherwise>
</choose>
NUM
FROM REPORT_EMPLOYEE