Normalization
... Languages) – This organization started as a mechanism to standardize programming languages. 1965 – List Processing Task Force 1967 – Renamed Data Base Task Group During this time, hardware and software are closely linked, and both are purchased as part of a vendor package. ...
... Languages) – This organization started as a mechanism to standardize programming languages. 1965 – List Processing Task Force 1967 – Renamed Data Base Task Group During this time, hardware and software are closely linked, and both are purchased as part of a vendor package. ...
ppt - Purdue Computer Science
... To check if a functional dependency holds (or, in other words, is in F+), just check if +. ...
... To check if a functional dependency holds (or, in other words, is in F+), just check if +. ...
Chs. 1 + 2
... changing the logical schema • This is an example of modularity! • Applications depend on the logical schema ...
... changing the logical schema • This is an example of modularity! • Applications depend on the logical schema ...
Chapter 7: Relational Database Design
... To check if a functional dependency holds (or, in other words, is in F+), just check if +. ...
... To check if a functional dependency holds (or, in other words, is in F+), just check if +. ...
DATABASE SCHEMA INTEGRATION PROCESS
... A form type is a named tree structure, whose nodes are called component types. Each component type is identified by its name in the scope of the form type, and has nonempty sets of attributes and keys, and a set of unique constraints that may be empty. Besides, to each component type must be associa ...
... A form type is a named tree structure, whose nodes are called component types. Each component type is identified by its name in the scope of the form type, and has nonempty sets of attributes and keys, and a set of unique constraints that may be empty. Besides, to each component type must be associa ...
CO22001 Database Administrator
... A cursor provides a pointer to a single row in the result of a selection query (which may return may rows) Cursors are declared by statements similar to view definitions One row at a time is accessed through the cursor, which is moved to the next row before each data transfer The columns of that one ...
... A cursor provides a pointer to a single row in the result of a selection query (which may return may rows) Cursors are declared by statements similar to view definitions One row at a time is accessed through the cursor, which is moved to the next row before each data transfer The columns of that one ...
original - Kansas State University
... The order by clause can be used at the end of any expression. E.g. to return customers sorted by name for $c in /bank/customer order by $c/customer_name return { $c/* }
Use order by $c/customer_name to sort in descending order
Can sort at multiple levels of nesting (sort ...
... The order by clause can be used at the end of any expression. E.g. to return customers sorted by name for $c in /bank/customer order by $c/customer_name return
Build a database IV: Create queries for a new Access database
... It’s time to create queries, one of the most powerful tools in your database. Say you want to know how many computers you own. You can build a query to fetch that data and total the numbers. Queries can also provide data for your forms and reports, which can help make your database easier to build a ...
... It’s time to create queries, one of the most powerful tools in your database. Say you want to know how many computers you own. You can build a query to fetch that data and total the numbers. Queries can also provide data for your forms and reports, which can help make your database easier to build a ...
FROM EMPLOYEE
... • Subtotals may be calculated by using the GROUP BY clause. • The HAVING clause may be used to restrict which data is displayed. SELECT ...
... • Subtotals may be calculated by using the GROUP BY clause. • The HAVING clause may be used to restrict which data is displayed. SELECT ...
Computing with Java:
... For small applications, we can use files to store data, but as the amount of data that we need to save gets larger the services of a database system become invaluable. A database system allows us to model the information we need while it handles the details of inserting, removing, and retrieving dat ...
... For small applications, we can use files to store data, but as the amount of data that we need to save gets larger the services of a database system become invaluable. A database system allows us to model the information we need while it handles the details of inserting, removing, and retrieving dat ...
CS122_SUMMER_2009_LECTURE_09a
... Multi-Table DELETE Syntax Examples: -- Delete all ratings by semory. DELETE Ratings FROM Members JOIN Ratings USING(MemberID) WHERE Username = 'semory'; -- Delete all ratings by semory (alternate). DELETE R FROM Members A JOIN Ratings R USING(MemberID) WHERE Username = 'semory'; -- Delete all direc ...
... Multi-Table DELETE Syntax Examples: -- Delete all ratings by semory. DELETE Ratings FROM Members JOIN Ratings USING(MemberID) WHERE Username = 'semory'; -- Delete all ratings by semory (alternate). DELETE R FROM Members A JOIN Ratings R USING(MemberID) WHERE Username = 'semory'; -- Delete all direc ...
L - ELTE
... – a database instance consists of relations – q(I) denotes the result of applying q on I. ...
... – a database instance consists of relations – q(I) denotes the result of applying q on I. ...
Spatialite – A brief overview of this light-weight, cross
... zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. • A single lightweight library implementing the full SQL engine • standard SQL implementation: almost complete SQL-92 • no complex client/server architecture • no installation, ...
... zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. • A single lightweight library implementing the full SQL engine • standard SQL implementation: almost complete SQL-92 • no complex client/server architecture • no installation, ...
Advanced Database Features
... CREATE UNIQUE UNDEX mtf_thermometers_pk ON mtf_thermometers (part_id ASC) ...
... CREATE UNIQUE UNDEX mtf_thermometers_pk ON mtf_thermometers (part_id ASC) ...
Lecture 2 PowerPoint
... 1. Comment A comment is optional text that explains you program. Comments usually describe what a program does or why code was changed. Compilers are for humans—the compiler ignores them. A comment is introduced by two consecutive hypens and continues until the end of the line. -- This is a comment ...
... 1. Comment A comment is optional text that explains you program. Comments usually describe what a program does or why code was changed. Compilers are for humans—the compiler ignores them. A comment is introduced by two consecutive hypens and continues until the end of the line. -- This is a comment ...
JDBC
... Querying the Database: Example II Execute a select statement Statement stmt = conn.createStatement(); String str = "SELECT * FROM users”; Resultset rset = stmt.executeQuery(str); ...
... Querying the Database: Example II Execute a select statement Statement stmt = conn.createStatement(); String str = "SELECT * FROM users”; Resultset rset = stmt.executeQuery(str); ...
Database
... since it will list all combinations (i.e. if book contains 20 rows and publisher 8 rows, then the result will be 160=20x8) ...
... since it will list all combinations (i.e. if book contains 20 rows and publisher 8 rows, then the result will be 160=20x8) ...
SQL Commands
... the same way as a table. An interesting point about an indexed view is that the query optimizer may reference a view to improve performance even if it is not referenced in the query. Before you can create an indexed view, you need to make sure that all the referenced tables meet a few requirements. ...
... the same way as a table. An interesting point about an indexed view is that the query optimizer may reference a view to improve performance even if it is not referenced in the query. Before you can create an indexed view, you need to make sure that all the referenced tables meet a few requirements. ...
What will happen if we run count(*) with limit statement? It will return
... It doesn’t affect the auto increment value. TRUNCATE: TRUNCATE removes all rows from a table. The operation cannot be rolled back and no triggers will be fired. As such, TRUCATE is faster and doesn't use as much undo space as a DELETE. It doesn’t support TRANSACTION. It reset auto increment value. D ...
... It doesn’t affect the auto increment value. TRUNCATE: TRUNCATE removes all rows from a table. The operation cannot be rolled back and no triggers will be fired. As such, TRUCATE is faster and doesn't use as much undo space as a DELETE. It doesn’t support TRANSACTION. It reset auto increment value. D ...
adbms tutorial 2 lahore leads university
... database. You can refer to a table in the default database using tableName directly; but you need to use the fully-qualified databaseName.tableName to refer to a table NOT in the default database. In our example, we have a database named "southwind" with a table named "products". If we issue "USE so ...
... database. You can refer to a table in the default database using tableName directly; but you need to use the fully-qualified databaseName.tableName to refer to a table NOT in the default database. In our example, we have a database named "southwind" with a table named "products". If we issue "USE so ...
Caching Management of Mobile DBMS
... new attributes into an existing cache relation, use UPDATE command in SQL to insert values for the new attributes of the cache relation. Note that one base relation can only produce one cache relation and more attributes can be added into the cache relation later. A cache relation will not be split ...
... new attributes into an existing cache relation, use UPDATE command in SQL to insert values for the new attributes of the cache relation. Note that one base relation can only produce one cache relation and more attributes can be added into the cache relation later. A cache relation will not be split ...