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<!doctype html>
<body>
if you are looking how to create a table with unique colored columns
you can do this
<table border="1">
<tr><span class="1"><td>Salary</td></span></tr>
</body>
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IF NOT EXISTS(SELECT * FROM sys.columns WHERE Name = 'ColumnName'
AND object_id = OBJECT_ID('YourTableName'))
BEGIN
ALTER TABLE dbo.YourTableName
ADD ColumnName INT -- or whatever it is
END