mysql - SQL query to get id of all elements in a tree -

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can 1 suggest me how id of children of particular tree.

table structure :

table 1 : customer                         table 2 : hierarchy cid     hid                                hid            cid 1       1                                  1              null 2       2                                  2              null 3       3                                  3                2 4       4                                  4                3 5       5                                  5                2 6       6                                  6                5 7       7                                  7                7

table (customer) main element , table hierarchy maintain hierarchy of customer.

i have give cid 2 root customer(parent). have cid child of cid 2 (given).

expected result of above scenario 2,3,4,5,6 (2 given , these id set customer ids). actual answer query should return.

i looked recursive query, procedure , join unable result.

applicable mysql, postgresql , sql server

you can use recursive queries sql server using cte (common table expressions).

syntax follows:

with cte (     select id hierarchy id =2     union     select id hierarchy child     inner join cte parent on child.parentid=parent.id ) select * cte

read more here: http://technet.microsoft.com/en-us/library/ms186243(v=sql.105).aspx


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