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Using a join on 3 tables, select 5 columns and 10 rows from the 3 tables without the use of a Cartesian product
Query:
SELECT E.LAST_NAME, E.FIRST_NAME, S.BUILDING, S.BRANCH, C.COMPANY FROM EMPLOYEE1 E JOIN STAFF S ON E.EMP_ID=S.EMP_ID JOIN CONTRACT C ON C.EMP_ID=S.EMP_ID WHERE ROWNUM<6;
Select distinct rows using joins on 3 tables without the use of a Cartesian product.
SELECT DISTINCT E.LAST_NAME,E.FIRST_NAME,S.BUILDING,S.BRANCH,C.COMPANY FROM EMPLOYEE1 E JOIN STAFF S ON E.EMP_ID=S.EMP_ID JOIN CONTRACT C ON C.EMP_ID=S.EMP_ID;
Inserting Objects: You can use the INSERT statement to add objects to an object table. In the illustration below, you insert a Person object into the object table persons:
Parameter and Keyword Description: cursor_variable_name: This identifies a cursor variable or the parameter formerly declared within the present scope. host_cursor_va
%ROWTYPE: This attribute gives a record type which represents a row in the database table or a row fetched from a formerly declared cursor. The Fields in the record and corresp
Referencing Records Unlike the elements in a collection, that are accessed using subscripts, the fields in a record are accessed by name. To reference an individual field, you
Running the PL/SQL Wrapper To run the PL/SQL Wrapper, go through the wrap command at your operating system prompt by using the syntax as shown: wrap iname=input_file [oname=
Using Operator DEREF: You cannot navigate through refs within the PL/SQL procedural statements. Rather than, you should use the operator DEREF in the SQL statement. The DEREF
which operation is used if we are interested in only certain columns of a table?
Using Invoker Rights: By default, the stored procedure executes with the privileges of its definer, not its invoker. These procedures are bound to the schema in which they inh
Task 2 [12 marks] Write the package body for the following package specification (the detailed description of each function and procedure is provided in the appendix below). Place
Relational Operators and Logical Operators It prepares the ground for subsequent sections in which each specific relational operator is paired with its logical counterpart, su
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