CREATE TABLE table_71738 ("7:00" TEXT, "7:30" TEXT, "8:00" TEXT, "8:30" TEXT, "9:00" TEXT, "9:30" TEXT, "10:00" TEXT)

What is on at 8:30 when etalk is on at 7:00 on that channel?
SELECT "8:30" FROM table_71738 WHERE "7:00" = 'etalk'
SELECT "8:30" FROM "table_71738" WHERE "7:00" = 'etalk'