Esproc, Data, Data Analysis, Development, Esproc Spl.
TradeDate) THEN 0 ELSE 1 END UpDownTag FROM Stock ) ) GROUP BY NoRisingDays ) SQL adopts a four-layer nested code, which is more complicated overall. This problem was once used as a recruitment test of our company, the pass rate was less than 20%. Since this test question was too difficult, we