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我有两张表： 产品表products： productsID //产品编号 productname //产品名称 ProductTypeID //所属类型编号 产品类型表ProductType: Pr

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公司有一条SQL语句写的是： WITH RECURSIVE r AS ( SELECT * FROM test1 as t WHERE m_id = 18 union ALL SELECT t.* F

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从sqlserver数据迁移后发现mysql不支持with as，请问mysql中有什么语法可以代替with as

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本人SQL新手，刚用WITH AS 递归查询做了一个BOM查询表。请问如何增加一列，该列是此BOM的顶级物料啊？with recursion as( select *,0 as 'Level' fro

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DECLARE @test_dbcc TABLE ( 表编号 VARCHAR(50) , 父级GID VARCHAR(50) ); WITH DEPT_TREE AS ( SELECT 表编号 , 父

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WITH n(parentId) AS (SELECT menuId FROM TSYS_MENU WHERE menuid in <foreach item="item" index="index" collection="menuIds" open="(" separator="," close=")"> #{item} </foreach> UNION ALL SELECT parentId FROM TSYS_MENU WHERE menuid in <foreach item="item" index="index" collection="menuIds" open="(" separator="," close=")"> #{item} </foreach> UNION ALL SELECT nplus.parentId FROM TSYS_MENU as nplus, n WHERE n.parentId = nplus.menuid) SELECT distinct parentId FROM n where parentId is not null 代码如上，如何在mysql中转换

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数据库表名：test 字段及其样例数据： --------------------------------- id parent_id --------------------------------