CREATE TABLE table_4310 ("Time Period" CLOB, "Position" CLOB, "Bureau" CLOB, "Office" CLOB, "District Attorney" CLOB)

Tell me the DA for bureau chief ada
SELECT "District Attorney" FROM table_4310 WHERE "Position" = 'bureau chief ada'
SELECT "District Attorney" FROM "table_4310" WHERE "Position" = 'bureau chief ada'