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Effects of NULL in Table Literal
When a VALUES expression appears as the source value for an SQL INSERT statement, the key word NULL can appear as a field value, such that for example INSERT INTO ENROLMENT VALUES ( 'S1', NULL, 'C1' ) is permitted as short for INSERT INTO ENROLMENT( StudentId, Name, CourseId ) VALUES ( 'S1', CAST ( NULL AS VARCHAR(50) ), 'C1' ). (I omitted the column name list in the short form just to remind you of the significance of column order in SQL.)
UNION and OR - SQL SQL supports UNION explicitly but differently from the way it supports JOIN explicitly. As we have seen, JOIN is used exclusively within the FROM clause, su
Processing Transactions This part describes how to do the transaction processing. You learn the fundamental techniques that safeguard the consistency of your database, involvin
Consider the schema for FreeChecking Bank, that we designed given below. Translate the given ER schema into SQL CREATE TABLE statements (indicating primary key, unique and foreign
An analyst in the quality assurance office reviews the time lapse between receiving an order and shipping an order. Any orders that have not been shipped within a day of the order
Using Subqueries A subquery is a query (typically enclosed by parentheses) that appears within another SQL data manipulation statement. If evaluated, the subquery gives a va
Order of Evaluation When you do not use the parentheses to specify the order of evaluation, the operator precedence determine the order. Now compare the expressions below: NOT
Variable Declaration - SQL SQL's support for variables is very similar to Tutorial D's, except that the syntax for creating persistent variables-base tables-is quite differen
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query to Find the account numbers of all customers whose balance is more than 10,000 $
In Packages The Forward declarations also group logically related subprograms in the package. The subprogram specifications go in the package specification, & the subprogram b
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