Both Sachinvaishnav and Mark Chad have submitted scripts to populate a column with a sequence number. The first solution uses a cursor; the second uses the SQL 2005 ROW_NUMBER() function.v1:http://www.sqlservercentral.com/scripts/viewscript.asp?scriptid=1643v2:http://www.sqlservercentral.com/scripts/viewscript.asp?scriptid=1664Since neither script requires a specific order for the sequence number, the same result can be achieved with a single UPDATE statement.

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2006-04-26 (first published: 2006-04-11)

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Question of the Day

Adding new column with DEFAULT

Which number will the COUNT() return after executing the following statements:

DROP TABLE IF EXISTS #test;
CREATE TABLE #test (id INT)
INSERT INTO #test (id)
SELECT *
  FROM GENERATE_SERIES(1, 3) AS gs
;

ALTER TABLE #test ADD flag BIT CONSTRAINT DF_#test_flag DEFAULT 0;
go
UPDATE #test SET flag = 0 WHERE id = 1
UPDATE #test SET flag = 1 WHERE id = 2

INSERT INTO #test (id) VALUES (4)

SELECT COUNT(*)
  FROM #test AS t
 WHERE flag = 0

See possible answers