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none of the above13.4NF is designed to cope with:14.Every Boyee-Codd normal form is in
15.Which command is used to remove all rows from a table?16.Which of the following is an aggregate function in SQL?a.Unionb.Likec.Group Byd.Max17.Which command is used to add a column to an existing table?18.A deadlock exists in the system if and only if the wait for graph:19.Rollback of transactions is normally used to:20.Prevention of access to the database by unauthorized users is referred to as:a.Integrity b. Productivityb.Security d. Reliability
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