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

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'