Lab Assignment # 1
... 2. Which of the following PL/SQL blocks executes successfully? For the blocks that fail, explain why they fail A. BEGIN END; B. DECLARE ...
... 2. Which of the following PL/SQL blocks executes successfully? For the blocks that fail, explain why they fail A. BEGIN END; B. DECLARE ...
Week 8 - Seattle Colleges
... are and the available SQL database options in the market. This article also focuses on SQL99 and some of its key features. Security and Compatibility are two most significant features of SQL databases. Storing data in a SQL database is more secure than ever before. SQL databases are compatible with ...
... are and the available SQL database options in the market. This article also focuses on SQL99 and some of its key features. Security and Compatibility are two most significant features of SQL databases. Storing data in a SQL database is more secure than ever before. SQL databases are compatible with ...
Course Topics - Webject Systems Inc
... More Trigger Concepts Create triggers that fire when certain database actions occur List some of the limitations of database triggers Determine when to use database triggers or Oracle Server features Create triggers by using alternative events (notINSERT/UPDATE/DELETE) Create triggers by using alter ...
... More Trigger Concepts Create triggers that fire when certain database actions occur List some of the limitations of database triggers Determine when to use database triggers or Oracle Server features Create triggers by using alternative events (notINSERT/UPDATE/DELETE) Create triggers by using alter ...
Slide 1
... may indicate a performance problem. Generally, they occur for two different reasons. First, there may be too many rows to retrieve, relative to the total number of rows in the table. See the "Estimated Row Count" to verify this. Second, it may be due to the column queried in the WHERE clause may not ...
... may indicate a performance problem. Generally, they occur for two different reasons. First, there may be too many rows to retrieve, relative to the total number of rows in the table. See the "Estimated Row Count" to verify this. Second, it may be due to the column queried in the WHERE clause may not ...
SQL is a standard computer language for accessing and
... Informix, MS SQL Server, Oracle, Sybase, etc. Unfortunately, there are many different versions of the SQL language, but to be in compliance with the ANSI standard, they must support the same major keywords in a similar manner (such as SELECT, UPDATE, DELETE, INSERT, WHERE, and others). Note: Most of ...
... Informix, MS SQL Server, Oracle, Sybase, etc. Unfortunately, there are many different versions of the SQL language, but to be in compliance with the ANSI standard, they must support the same major keywords in a similar manner (such as SELECT, UPDATE, DELETE, INSERT, WHERE, and others). Note: Most of ...
SQL Server Performance Tuning and Optimization
... may indicate a performance problem. Generally, they occur for two different reasons. First, there may be too many rows to retrieve, relative to the total number of rows in the table. See the "Estimated Row Count" to verify this. Second, it may be due to the column queried in the WHERE clause may not ...
... may indicate a performance problem. Generally, they occur for two different reasons. First, there may be too many rows to retrieve, relative to the total number of rows in the table. See the "Estimated Row Count" to verify this. Second, it may be due to the column queried in the WHERE clause may not ...
Mapping between Alloy specifications and database implementations
... not relevant since the semantics of extends and abstract matches that of most object-oriented languages, and thus can easily be enforced in the application layer. INDs allow us to specify inclusions between arbitrary projections of relations. In Alloy, projections can be specified by composing relat ...
... not relevant since the semantics of extends and abstract matches that of most object-oriented languages, and thus can easily be enforced in the application layer. INDs allow us to specify inclusions between arbitrary projections of relations. In Alloy, projections can be specified by composing relat ...
Cursors in Pl/SQL
... • To process an SQL statement, Oracle opens a work area called private SQL area. • The private SQL area stores information needed to execute the SQL statement. • An identifier called cursor lets you name a SQL statement, access the information in its private SQL area, and, to some extent, control it ...
... • To process an SQL statement, Oracle opens a work area called private SQL area. • The private SQL area stores information needed to execute the SQL statement. • An identifier called cursor lets you name a SQL statement, access the information in its private SQL area, and, to some extent, control it ...
Slides for Ch-3
... numeric(p,d). Fixed point number, with user-specified precision of p digits, with n digits to the right of decimal point. real, double precision. Floating point and double-precision floating point numbers, with machine-dependent precision. float(n). Floating point number, with user-specified precisi ...
... numeric(p,d). Fixed point number, with user-specified precision of p digits, with n digits to the right of decimal point. real, double precision. Floating point and double-precision floating point numbers, with machine-dependent precision. float(n). Floating point number, with user-specified precisi ...
Document
... condition that compares specified columns of each table – Outcome does not eliminate duplicate columns – Condition or criterion to join tables must be explicitly defined – Takes its name from the equality comparison operator (=) used in the condition ...
... condition that compares specified columns of each table – Outcome does not eliminate duplicate columns – Condition or criterion to join tables must be explicitly defined – Takes its name from the equality comparison operator (=) used in the condition ...
SQL Server Administrative Duties
... RDBMS stands for Relational Database Management System. RDBMS data is structured in database tables, fields and records. Each RDBMS table consists of database table rows. Each database table row consists of one or more database table fields. RDBMS store the data into collection of tables, which ...
... RDBMS stands for Relational Database Management System. RDBMS data is structured in database tables, fields and records. Each RDBMS table consists of database table rows. Each database table row consists of one or more database table fields. RDBMS store the data into collection of tables, which ...
Essential Computing for Bioinformatics
... Structured Databases at a Glance - Characteristics Advantages of Structured Databases Data Independence Disadvantages of Structured Databases Examples of Structured Databases ...
... Structured Databases at a Glance - Characteristics Advantages of Structured Databases Data Independence Disadvantages of Structured Databases Examples of Structured Databases ...
Chapter # 8 (Advanced SQL)
... requires many data manipulations SQL functions similar to functions in programming languages Functions always use numerical, date, or string value Value may be part of a command or attribute in a table Function may appear anywhere in an SQL statement ...
... requires many data manipulations SQL functions similar to functions in programming languages Functions always use numerical, date, or string value Value may be part of a command or attribute in a table Function may appear anywhere in an SQL statement ...
(A) R
... If the first two characters are extracted to find the department, the domain of roll numbers is not atomic. Doing so is a bad idea: leads to encoding of information in application program rather than in the database. ...
... If the first two characters are extracted to find the department, the domain of roll numbers is not atomic. Doing so is a bad idea: leads to encoding of information in application program rather than in the database. ...
ERC+: an object+relationship paradigm for database applications
... data manipulations, no concept for the description of the global application behavior. Extending the OO data model results in what is nowadays known as an object+relationship (OR) modeling approach. OR models intend to combine the advantages of OO models with those provided by semantic data models. ...
... data manipulations, no concept for the description of the global application behavior. Extending the OO data model results in what is nowadays known as an object+relationship (OR) modeling approach. OR models intend to combine the advantages of OO models with those provided by semantic data models. ...
Chapter 2: Relational Model
... ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
... ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
The SDL Library: Querying a Relational Database with an Ontology, Rules and the Jess Engine
... Moreover, it simplifies posing a question than using structural constructions from SQL. This kind of query evaluation is called the rule-based query answering method. As a result a user gets an easy way to query a relational database and both a query and an answer are based on the semantics defined ...
... Moreover, it simplifies posing a question than using structural constructions from SQL. This kind of query evaluation is called the rule-based query answering method. As a result a user gets an easy way to query a relational database and both a query and an answer are based on the semantics defined ...
sql - structured query language
... If any column name occurs in more than one table, and that column is used anywhere in the query then it must be identified by specifying the table name as a prefix. If this is not done then an error message indicating that the column name is ambiguous will be returned. ...
... If any column name occurs in more than one table, and that column is used anywhere in the query then it must be identified by specifying the table name as a prefix. If this is not done then an error message indicating that the column name is ambiguous will be returned. ...
account-number
... The subset of R2 is a foreign key referencing K1 in relation r1, if for every t2 in r2 there must be a tuple t1 in r1 such that t1[K1] = t2[]. Referential integrity constraint also called subset dependency since its ...
... The subset of R2 is a foreign key referencing K1 in relation r1, if for every t2 in r2 there must be a tuple t1 in r1 such that t1[K1] = t2[]. Referential integrity constraint also called subset dependency since its ...
Ch08_updated
... Nested Queries • In addition to the IN operator, a number of other comparison operators can be used to compare a single value (attribute) to a set or multiset. • The keywords ANY or ALL can be combined with the following operators: >, >=, <, <=, <>. (= ANY is equivalent to IN) • Query: list the nam ...
... Nested Queries • In addition to the IN operator, a number of other comparison operators can be used to compare a single value (attribute) to a set or multiset. • The keywords ANY or ALL can be combined with the following operators: >, >=, <, <=, <>. (= ANY is equivalent to IN) • Query: list the nam ...
Processing Semi-Structured Data in Object Bases
... many kinds of databases users. A query language makes a sense only in combination with other database functionalities, in particular, with application programming interfaces. Hence, providing the theories will be implemented, semi-structured data will impose ad hoc solutions in all functionalities t ...
... many kinds of databases users. A query language makes a sense only in combination with other database functionalities, in particular, with application programming interfaces. Hence, providing the theories will be implemented, semi-structured data will impose ad hoc solutions in all functionalities t ...