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You cannot create a view with a definition that contains a parameter, so you might have to make a view for each separate situation: Alternatives to Views 19 CREATE VIEW View1 AS SELECT * FROM Table1 WHERE column1 = 1 WITH CHECK OPTION CREATE VIEW View2 AS SELECT * FROM Table1 WHERE column1 = 2 WITH CHECK OPTION And so on. But in future this too might become obsolete. It is already fairly easy to make stored procedures that handle the job. If you want to do a materialization but don't want (or don't have the authority) to make a new view, you can do the job within one statement.

It is a very simple "log file" that shows when someone starts and ends a session with the system. We do not even care who the user was, since I am assuming that user_activity_id is a unique number that identifies a session, without identifying individual users. ); Keeping Time 43 Using a NULL in the logout column to mean that the session is still active adds a little complexity to the problem. I decided to use the current timestamp at the time the query is executed as the logout time. I would like to be able to report the number of user sessions logged on during each hour of the day.

We can declare a simple version of this table. CREATE TABLE Documents (document_id INTEGER NOT NULL, key_word VARCHAR(25) NOT NULL, PRIMARY KEY (document_id, key_word)); Your assignment is to write a general searching query in SQL. You are given a list of words that the document must have and a list of words which the document must NOT have. We need a table for the list of words which we want to find: CREATE TABLE SearchList (word VARCHAR(25) NOT NULL PRIMARY KEY); And we need another table for the words that will exclude a document.

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