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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;
DELETE Statement The DELETE statement eliminates whole rows of data from the specified table or view. Syntax:
Effects of NULL for union - SQL The treatment of NULL in invocations of EXCEPT is as for UNION. This is different from its treatment in those of NOT IN and quantified compari
Object Types An object type is a user-defined complex datatype which encapsulates the data structure along with the functions and procedures required to manipulate the data. Th
UTL_FILE: The Package UTL_FILE permits your PL/SQL programs to read & write operating system (OS) text files. It gives a restricted version of the standard OS stream file I/O,
Using Operator VALUE: As you may expect, the operator VALUE returns the value of an object. The VALUE takes its argument a correlation variable. For illustration, to return a
Other monadic - SQL In 2VL there are just 4 (2 2 ) monadic operators, of which negation is really the only "useful" one. When a third truth value is introduced we have 27 (3 3
Tautology - Equivalences Rules: If there Tautologies are not all the time as much easy to note as the one above so than we can use these truth tables to be definite that a sta
Third Step at defining type SID in SQL CREATE DOMAIN SID AS VARCHAR(5) CHECK ( VALUE IS NOT NULL AND SUBSTRING(VALUE FROM 1 FOR 1) = 'S' AND CAST('+'||SUBSTRING(VALUE
Using %ROWTYPE The %ROWTYPE attribute gives a record type which represents a row in a table (or view). The record can store the whole row of data selected from the table or fetc
Dynamic Ranges The PL/SQL lets you determine the loop range dynamically at run time, as the example below shows: SELECT COUNT(empno) INTO emp_count FROM emp; FOR i IN 1..emp_cou
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