学员队编号, 实施_机关编号
INSERT INTO 实施_机关_学员队 (学员队编号, 实施_机关编号)
SELECT #{relation.xydbh}, #{relation.ssjgbh}
FROM DUAL
WHERE NOT EXISTS (
SELECT 1 FROM 实施_机关_学员队
WHERE 学员队编号 = #{relation.xydbh}
)
DELETE FROM 实施_机关_学员队
WHERE 实施_机关编号 = #{departmentId}
AND 学员队编号 = #{teachingClassId}