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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;
Advantages of PL/SQL The PL/SQL is a high-performance transaction processing, completely portable language that offers the following advantages as shown: 1) Support for SQL
Disjunction (OR, ∨) Again we have nine rows instead of just four and again, when unknown is not involved, the rows are as for 2VL. Also, when anything is paired with true, t
Keyword and Parameter Description: table_reference: This specifies a table or view that should be accessible when you execute the DELETE statement, and for that you must
Example of Tables within a Table - SQL Example: Obtaining C_ER from COURSE and EXAM_MARK SELECT CourseId, CAST (TABLE (SELECT DISTINCT StudentId, Mark FROM EXAM_MARK AS EM
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Package STANDARD The package named STANDARD defines the PL/SQL atmosphere. The package specification globally declares the exceptions, types, and subprograms that are available
Brewbean's is implementing a new discount for return shoppers - every fifth completed order receives a 10% discount. The count of orders for a shopper is placed in a packaged varia
Character Types The Character types allow you to store alphanumeric data, represent words and text, and manipulate the character strings. CHAR You use the CHAR dataty
ALTER TABLE bb_basketitem ADD CONSTRAINT bitems_qty_ck CHECK (quantity BEGIN INSERT INTO bb_basketitem VALUES (88,8,10.8,21,16,2,3); END; Brewbean’s wants to add a check
Number Types The Number types permit you to store the numeric data (real numbers, integers, and floating-point numbers), show quantities, and do computations. BINARY_INTEG
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