SQLite Tree Structure Query

Source: Internet
Author: User

Table Structure: tblcity (ID, parentid, name)

Because SQLite does not have the row_number function, it cannot perform recursive queries. Fortunately, it has the rowid field. We have to use this stupid method.

1)

 

Select ID, name, 1 as level from tblcity where parentid = 0 Union all select. ID,. name, C. rowid as level from tblcity a inner join tblcity B on. parentid = B. idinner join (select parentid from tblcity group by parentid) C on. parentid = C. parentid

2)

 

 

Select ID, name, 1 as level from tblcity where parentid = 0 Union all select. ID,. name, C. rowid as level from tblcity a inner join tblcity B on. parentid = B. idinner join (select parentid from tblcity group by parentid) C on. parentid = C. parentid

 

 

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