The SQL keyword(s) ________ is used with wildcards.

The Java packages which contain JDBC classes and interfaces is Java.SQL.

LIKE, BETWEEN and = operators are used for comparison in SQL. Comparison operators test whether two expressions are the same. Comparison operators can be used on all expressions except expressions of the text, ntext, or image data types.

Count function in SQL returns the number of values or rows.

A relational database developer refers to a record as a tuple.

The collections of entities of a particular Entity Type are grouped together into an entity set.

To join 'n' tables 'n-1' conditions should be satisfied.

So to join 4 tables 3 conditions should be satisfied.

Integrity constraints are used to ensure accuracy and consistency of data in a relational database. Data integrity is handled in a relational database through the concept of referential integrity. Many types of integrity constraints play a role in referential integrity (RI).

Hence, Data integrity constraints are used to Improve the quality of data entered for a specific property i.e, table column.

The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all rows from all tables fitting your query specifics and combines them into a table. A UNION statement effectively does a SELECT DISTINCT on the results set.