轉mysql 樹查詢語句 原鏈接：http://skudy.iteye.com/blog/1434254 求下級所有節點 SELECT b.* FROM tree AS a, tree AS b WHERE a.id= b.pid AND(a.id= ? OR a.pi= ?) 求所有子節點 SELECT * FROM tree t WHERE NOT EXISTS( SELECT 1 FROM tree t1, tree t2

mysql 樹查詢語句

原鏈接：http://skudy.iteye.com/blog/1434254

求下級所有節點

SELECT

b.*

FROM

tree AS a,

tree AS b

WHERE

a.id= b.pid

AND(a.id= ? OR a.pi= ?)

求所有子節點

SELECT

*

FROM

tree t

WHERE

NOT EXISTS(

SELECT

1

FROM

tree t1,

tree t2

WHERE

t1.id= t2.pid

AND t1.id= t.id

)

求所有根節點

SELECT

*

FROM

tree t

WHERE

NOT EXISTS(

SELECT

1

FROM

tree t1,

tree t2

WHERE

t1.id= t2.pid

AND t1.id= t.pid

)

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