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[PDF File]Translating SQL into the Relational Algebra
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Assertions: Check over several tables Any logical expression involving an SQL statement can be used to constrain tables in the database. CREATE ASSERTION Salary_Mgr CHECK (NOT EXISTS (SELECT * FROM Employee E, Employee M WHERE E.salary > M.salary AND E.mgr = M.id )) Employee( id, name, address, mgr, salary )
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[PDF File]Handling Missing Values in the SQL Procedure
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Part of an active database –specifies actions that automatically occur as a result of database events Typically composed of three components 1. Database update event(s) 2. Before/after the event(s) occur, the conditionthat determines if the rule action applies 3. The actionto be taken, typically a set of SQL statements CREATE TRIGGER trigger_name
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[PDF File]SQL: Queries, Constraints, Triggers
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PROC SQL as a powerful database management tool provides many features available in the DATA steps and the MEANS, TRANSPOSE, PRINT and SORT procedures. If properly used, PROC SQL ... 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
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[PDF File]SQL – Assertion
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Pervasive.SQL 2000i Pervasive.SQL User’s Guide Guide to Using Pervasive.SQL Pervasive Software, Inc. 12365 Riata Trace Parkway Building II Austin, TX 78727 USA
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[PDF File]M y S Q L b y E x a m p l e s f o r B e g i n n e r s
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Database Management Systems 3ed, R. Ramakrishnan and J. Gehrke 12 Nested Queries with Correlation EXISTS is another set comparison operator, like IN. If UNIQUE is used, and * is replaced by R.bid, finds sailors with at most one reservation for boat #103. (UNIQUE checks for duplicate tuples; * denotes all attributes.
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[PDF File]Pervasive.SQL User's Guide
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subqueries in the WHERE conditions are of the form EXISTS or NOT EXISTS. 4 Context relations To translate a query with subqueries into the relational algebra, it seems a logical strategy to work by recursion: rst translate the subqueries and then combine the translated results into a translation for the entire SQL state-ment.
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[PDF File]Extension to SQL: View, Triggers, Cursor
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• With SQL and a Spatial Type you can-Create Tables with a spatial attribute-Read and analyze spatial data-Insert, update and delete simple features • Enhacnes efficiency-Data and methods are stored in the database-Applications access native dbms type • Access using common API‘s and SQL-Standard functions-Well-known interchange formats
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[PDF File]SQL: Part 2 DDL+
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• Assertions = conditions that the database must always satisfy • Domain constraints and referential -integrity constraints are specific forms of assertions • CHECK– verify the assertion on one -table, one-attribute • ASSERTION– verify one or more tables, one or more attributes Some constraints cannot be expressed by using only domain
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Check If Database Exists Using T-SQL
mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec) I M P O RTA N T : Use SQL DROP (and DELETE) commands with extreme care, …
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Sql check if database exists