tktcompanyvn

Công ty TKT Company là đơn vị hàng đầu tại TP.HCM chuyên cung cấp các giải pháp: Vệ Sinh Công Nghiệp, Kiểm Soát Dịch Hại, Bảo Trì Tòa Nhà với cam kết Toàn Diện - Trọn gói - Linh Hoạt - Chuyên Nghiệp dành cho: tòa nhà văn phòng, tòa nhà cao ốc, nhà máy, nhà xưởng, trường học, bệnh viện, nhà ở,...
Website: https://tktg.vn/
Hotline: 0938172294
Địa chỉ: 161 Ung Văn Khiêm, Phường 25, Quận Bình Thạnh, TP Hồ Chí Minh
Maps: https://maps.app.goo.gl/Qd24Rn1BDF8fsLCSA
#tktcompany #tktcleaning #congtyvesinh #vesinhcongnghiep #congtyvesinhtktcompany

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return:

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

See possible answers