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[PDF File]CSE 480 DatabaseSystems SQL:Structured Query Language
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Let’s Try (NOT EXISTS) Find the name(s) of the customer(s) who has a loan but does not have an account. Do not repeat the customer name. SELECT DISTINCT B.customer_name FROM borrower AS B WHERE NOT EXISTS (SELECT * FROM depositor AS D WHERE B.customer_name = D.customer_name); Correlated tuple(s) account (account_number, branch_name, balance)
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[PDF File]Handling Missing Values in the SQL Procedure
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exists. select * from PRODUCTS P where not exists (select ⇤ from o↵ers where P.Prodname = Prodname); + attributes without preceding alias refer to relations listed in the from clause of the subquery where the attributes occur. • Find all suppliers that o↵er a MegaPC, but no TinyMac. select ⇤ from SUPPLIERS S where exists (select ...
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[PDF File]4. SQL
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EXISTS AND UNIQUE FUNCTIONS [NOT] EXISTS function •Check whether result of correlated nested query is empty or not •EXISTS equivalent to (SELECT COUNT(*) … ) 0 SELECT name, phone FROM Customer C WHERE NOT EXISTS ( SELECT * FROM Sale S WHERE C.custid = S.custid); • Note that columns selected in inner query are irrelevant.
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[PDF File]4. SQL
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EXISTS and NOT EXISTS are logical operators whose value is either true or false depending on the presence or absence of rows that fit the qualifying conditions. 28. The INSERT clause can only be used to insert a single row into a table. 29. Using the DELETE clause to delete a row from one table can cause an integrity problem in another table. 30.
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[PDF File]SQL (5): Subqueries in WHERE clause
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NOT EXISTS true. However, in SQL procedure, missing values are normal comparable values that would be used in evaluation of subquery. 3. MISSING VALUES AND JOINS In SQL procedure, a missing value equals to itself. When joining tables with missing values, the results are most likely different
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[PDF File]NESTED QUERIES AND AGGREGATION
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occur. Subqueries can occur in the WHERE clause through the operators =, , =, ; through the quanti ers ANY, or ALL; or through the operators EXISTS and IN and their negations NOT EXISTS and NOT IN. We can easily rewrite all of these cases using only EXISTS and NOT EXISTS, however, as illustrated next. Example 2. The SQL-statement
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[PDF File]Translating SQL into the Relational Algebra
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•RPG supports the SQL WHERE EXISTS clause •We can combined RPG with SQL to simulate the "IF EXISTS" condition. IF EXISTS in RPG 1. Add an "If Exists" flag (indicator variable) 2. SELECT '1' INTO that variable from SYSDUMMY1 3. Nest the EXISTS clause within the WHERE clause 4. Test the Exists variable for true (*ON) condition
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[PDF File]TRUE/FALSE
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exists. select * from PRODUCTS P where not exists (select from o ers where P.Prodname = Prodname); + attributes without preceding alias refer to relations listed in the from clause of the subquery where the attributes occur. Find all suppliers that o er a MegaPC, but no TinyMac. select from SUPPLIERS S where exists (select from o ers where ...
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[PDF File]SQL – Subqueries in WHERE Clause
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SQL (5): Subqueries in WHERE clause CS 4750 –Database Systems FO US: SU QUERIES IN “WHERE” EXISTENTIAL QUANTIFIER (EXISTS / IN / ANY); UNIVERSAL QUANTIFIERS (NOT IN / NOT EXISTS / ALL). 1 [A. Silberschatz, H. F. Korth, S. Sudarshan, Database System Concepts, Ch.5.3]
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SQL NOT EXISTS Operator
Comparing Two Sets Using EXISTS and NOT EXISTS 1. Rephrase the above query as follows: Select each student such that there does not exist a course that John is taking and the student does not take the course. SELECT Sname (A) FROM S AS Sx WHERE NOT EXISTS (SELECT cno (B) FROM SC AS SCx WHERE cno IN (SELECT cno (C) FROM SC, S WHERE Sno=sno and ...
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Sql not exists clause