Table: malaysia_airlines_sub
Columns: company
type
principal_activities
incorporated_in
group_s_equity_shareholding

Question: What company focuses on Engine Overhaul for their principal activity?
SQL: SELECT "company" FROM malaysia_airlines_sub WHERE "principal_activities" = 'engine overhaul'

Question: What is the group equity shareholding for abacus distribution systems (malaysia) sdn bhd?
SQL: SELECT "group_s_equity_shareholding" FROM malaysia_airlines_sub WHERE "company" = 'abacus distribution systems (malaysia) sdn bhd'

Question: What company has a Group Equity Shareholding value of 60%?
SQL: SELECT "company" FROM malaysia_airlines_sub WHERE "group_s_equity_shareholding" = '60%'

Question: What is the Group Equity shareholding of the company that has their principal activities as catering, and is of the Associate type?
SQL: SELECT "group_s_equity_shareholding" FROM malaysia_airlines_sub WHERE "principal_activities" = 'catering' AND "type" = 'associate'