CREATE TABLE table_1889233_2 (period_in_office VARCHAR2, constituency_contested VARCHAR2)

What period were conscituency contested is aljunied grc?
SELECT period_in_office FROM table_1889233_2 WHERE constituency_contested = "Aljunied GRC"
SELECT "period_in_office" FROM "table_1889233_2" WHERE "Aljunied GRC" = "constituency_contested"