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

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'