Sybase code has has where clause: where a & b=c -

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i have code below:

select id,role,unit
user_id i,user_rol r,unit u
unit_grp_catg_map_c & ib_unit_grp_catg_c = ib_unit_grp_catg_c

can explain me & , how works?
cannot find on internet

& stands bitwise , operation, here have details.


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