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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 ALL - SQL Further varieties of UNION arise when we replace the key word DISTINCT by ALL in any of the foregoing examples, as in Example. ALL specifies that if row r appe
MAX and MIN operator in SQL Example: (SELECT MAX (Mark) FROM EXAM_MARK WHERE StudentId = 'S1') (SELECT MIN (Mark) FROM EXAM_MARK WHERE StudentId = 'S1') Example
On occasion, some of Brewbean's customers mistakenly leave an item out of a basket already checked out, so they create a new basket containing the missing items. However, they requ
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Using research notes and Oracle documentation plan and execute an upgrade of an installation of Oracle 10g to Oracle 11g release 1. To do this you must show in screen shots and wri
Keyword &Parameter Description: index_name: This is an undeclared identifier which can be referenced only within the FORALL statement and only as the collection subscript
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CURRVAL and NEXTVAL The series is a schema object which generates the sequential numbers. Whenever you form a sequence, you can specify its primary value and an increment. T
Use the MASCOT tables CREDITRS, PORDS and PAYMENTS to write SQL queries to solve the following business problems. These tables / data are available to you via the USQ Oracle server
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