sql - Getting a unique grouping id from related columns -

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i have table t 2 columns a, b

a    b --   -- a1   b1 a1   b2 a2   b1 a3   b1 a3   b4 null b4 a3   null a5   b6

i generate unique grouping related columns. since first 7 rows either directly or indirectly related, should constitute 1 group (g1) , remaining row have own group (g2). trying stay away custom function , seek pure sql solution actual table has on 1 million rows.


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