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What is the difference between a HAVING CLAUSE and a WHERE CLAUSE?
HAVING CLAUSE
- HAVING CLAUSE is used only with SELECT statement.
- It is normally used in a GROUP BY clause in a query.
- If GROUP BY isn't used, HAVING works like a WHERE clause.
WHERE Clause
- It is applied to every row before they become a part of GROUP BY function in a query.
What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).
The External or View Level The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see
What are the several forms of identity? a) Value b) Name c) Built-in
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Determine the Three Views of Data We know that the similar thing, if viewed from dissimilar angles produces difference sights. Similarly, the database that we have formed alrea
Retrieve the S&S In-Chapter Database (in Microsoft Access format) from the text's Web site (or create the tables in Table 4-5 in a relational DBMS product). Write queries to answer
Determine the advantage of object-orientation Finally, object-orientation has advantage of continuity throughout analysis, persistent representation and design implementation.
what is entity in database system?
What Is Recovery? During the life of a transaction, i.e., a after the start of a transaction but before the transaction commits, various changes may be made in a database state
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