表：gc_jzst_single_base

需求：要求返回这张表里符合条件的数据，且有父子级关系的，展示为同一组且分级，给后续业务调用

代码

WITH RECURSIVE t1 AS (
	SELECT
		single_id,
		old_build_single_id,
		single_name,
		bulid_code,
		1 AS LEVEL,
		single_id groupFlag 
	FROM
		gc_jzst_single_base 
	WHERE
		single_assort = '1' 
		AND build_status != '0' 
		AND single_type = 'DWGC_DTLX_0802' 
		AND old_build_single_id IS NULL UNION ALL
	SELECT
		b.single_id,
		b.old_build_single_id,
		b.single_name,
		b.bulid_code,
		t1.LEVEL + 1,
		t1.groupFlag 
	FROM
		gc_jzst_single_base b
		JOIN t1 
	WHERE
		b.old_build_single_id = t1.single_id 
		AND b.single_assort = '1' 
		AND b.build_status != '0' 
		AND b.single_type = 'DWGC_DTLX_0802' 
		AND b.old_build_single_id IS NOT NULL 
	) -- 终止条件部分
SELECT
	* 
FROM
	t1 
ORDER BY
	groupFlag;

结果：满足条件