CREATE TABLE table_14452 ("Sanskrit" CLOB, "Pali" CLOB, "Burmese" CLOB, "Khmer" CLOB, "Sinhala" CLOB, "Thai" CLOB, "# of days" CLOB, "~Gregorian" CLOB)

What Thai has a ~Gregorian of April May?
SELECT "Thai" FROM table_14452 WHERE "~Gregorian" = 'april–may'
SELECT "Thai" FROM "table_14452" WHERE "~Gregorian" = 'april–may'