CREATE TABLE table_38838 ("Name" TEXT, "Type" TEXT, "Entered service" TEXT, "Water depth" TEXT, "Location" TEXT)

Which is located in Angola and entered service in 1988?
SELECT "Name" FROM table_38838 WHERE "Location" = 'angola' AND "Entered service" = '1988'
SELECT "Name" FROM "table_38838" WHERE "Entered service" = '1988' AND "Location" = 'angola'