Heureka database upgrade script 0.5.4.3

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IF (SELECT COUNT(*) FROM VERSION WHERE ApplicationVersion = '0.5.4.2') = 0
BEGIN
		PRINT 'Wrong Version of database. You must upgrade to version 0.5.4.2 before running this script.';
		SELECT ApplicationVersion FROM VERSION;
END
ELSE 
BEGIN

	-- STATEMENTS NOT WORKING COMBINED WITHIN THE SAME BEGIN - END, THEREFORE ENTERED SEPARATELY

	IF NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Stratification' AND COLUMN_NAME = 'ModifiedDate')
	BEGIN
		ALTER TABLE [dbo].[Stratification] ADD
			[ModifiedDate] [datetime] NULL,
			[ModifiedBy] [varchar](50) NULL
	END
	GO

	IF EXISTS(SELECT * FROM Stratification WHERE ModifiedDate IS NULL)
	BEGIN
		UPDATE [dbo].[Stratification] SET
			ModifiedDate = CreatedDate,
			ModifiedBy = CreatedBy

		ALTER TABLE [dbo].[Stratification] ALTER COLUMN [ModifiedDate] [datetime] NOT NULL;
		ALTER TABLE [dbo].[Stratification] ALTER COLUMN [ModifiedBy] [varchar](50) NOT NULL;
	END



	-- Update version

	UPDATE Version SET ApplicationVersion = '0.5.4.3';
	PRINT 'Success! Database upgrade to version 0.5.4.3';

END