Question

Using MySQL, having x = 'aa.bb.cc', how can I obtain the list 'aa.bb.cc', 'aa.bb', 'aa'?

With x = '39.01', the list is '39.01', '39'.

With x = '39.02.01.01', the list is '39.02.01.01', '39.02.01', '39.02', '39'.

From the last example above with x = '39.02.01.01', I would want to be able to construct something like:

SELECT ... FROM ... WHERE foo IN bar

where bar is dynamically obtained as ('39.02.01.01', '39.02.01', '39.02', '39').

Any ideas would be appreciated.

Answer 1

I hope INSTR or LOCATE functions may work for you:

 SELECT * from TABLE table1 WHERE INSTR(bar, foo) = 1;

or

 SELECT * from TABLE table1 WHERE LOCATE(foo, bar) =1 ;

Here bar can be 39.02.01.01 and foo can be a substring e.g. '39.02.01.01', '39.02.01', '39.02', '39'.