Change Which Column Uniquely Identifies. A good way to think about indexes are used is to think of them as the order of columns in a spreadsheet. Alternate Key - is a column or group of columns in a table that uniquely identify every row in that table.
A unique key is a set of one or more than one columnfield of a table that uniquely identify a record in a database table. Programming Logic and Design Comprehensive 8th Edition Edit edition. So a candidate key is a superkey that contains no smaller superkey.
HAVING COUNT 1.
It depends upon the requirements and is done by the Database Administrator DBA. More formally a primary key is a choice of candidate key a minimal superkey. The best I can think of is to get the unique values of a subset of columns using a set comprehension and asserting that there are as many values in the set as there are rows in the dataframe. SET iStrike DATALENGTHvalue iDelimlength SET idx idx 1 SET sText LTrimRightsTextDATALENGTHsText - iStrike END ELSE BEGIN --If you cant find the delimiter in the text.
