Restrictions on Views

Shopping Sale 12:07
Restrictions on Views The ISO standard imposes several important restrictions on the creation and use of views, although there is consider...Read More
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View Resolution

Shopping Sale 12:06
View Resolution Having considered how to create and use views, we now look more closely at how a query on a view is handled. To illustrate...Read More
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Removing a View (DROP VIEW)

Shopping Sale 12:04
Removing a View (DROP VIEW) A view is removed from the database with the DROP VIEW statement: DROP VIEW ViewName [RESTRICT | CASCADE] DRO...Read More
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Creating a View (CREATE VIEW)

Shopping Sale 12:03
Creating a View (CREATE VIEW) The format of the CREATE VIEW statement is: CREATE VIEW ViewName [(newColumnName [, . . . ])] AS subselect ...Read More
Creating a View (CREATE VIEW) Creating a View (CREATE VIEW) Reviewed by Shopping Sale on 12:03 Rating: 5

Views

Shopping Sale 12:01
Views Recall from Section 3.4 the definition of a view: View The dynamic result of one or more relational operations operating on the base...Read More
Views Views Reviewed by Shopping Sale on 12:01 Rating: 5

Creating an Index (CREATE INDEX)

Shopping Sale 11:59
Creating an Index (CREATE INDEX) An index is a structure that provides accelerated access to the rows of a table based on the values of on...Read More
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Removing a Table (DROP TABLE)

Shopping Sale 11:58
Removing a Table (DROP TABLE) Over time, the structure of a database will change; new tables will be created and some tables will no longe...Read More
Removing a Table (DROP TABLE) Removing a Table (DROP TABLE) Reviewed by Shopping Sale on 11:58 Rating: 5
Changing a Table Definition (ALTER TABLE) Changing a Table Definition (ALTER TABLE) Reviewed by Shopping Sale on 11:57 Rating: 5

Creating a Table (CREATE TABLE)

Shopping Sale 11:55
Creating a Table (CREATE TABLE) Having created the database structure, we may now create the table structures for the base relations to be...Read More
Creating a Table (CREATE TABLE) Creating a Table (CREATE TABLE) Reviewed by Shopping Sale on 11:55 Rating: 5

Creating a Database

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Creating a Database The process of creating a database differs significantly from product to product. In multi-user systems, the authority...Read More
Creating a Database Creating a Database Reviewed by Shopping Sale on 11:52 Rating: 5

Data Definition

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Data Definition The SQL Data Definition Language (DDL) allows database objects such as schemas, domains, tables, views, and indexes to be ...Read More
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General Constraints

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General Constraints Updates to tables may be constrained by enterprise rules governing the real-world transactions that are represented by...Read More
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Referential Integrity

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Referential Integrity A foreign key is a column, or set of columns, that links each row in the child table containing the foreign key to t...Read More
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Entity Integrity

Shopping Sale 11:47
Entity Integrity The primary key of a table must contain a unique, non-null value for each row. For example, each row of the PropertyForRe...Read More
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Domain Constraints

Shopping Sale 11:46
Domain Constraints Every column has a domain, in other words a set of legal values (see Section 3.2.1). For example, the sex of a member o...Read More
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Integrity Enhancement Feature

Shopping Sale 11:45
Integrity Enhancement Feature In this section, we examine the facilities provided by the SQL standard for integrity control. Integrity con...Read More
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Exact Numeric Data

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Exact Numeric Data The exact numeric data type is used to define numbers with an exact representation. The number consists of digits, an o...Read More
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SQL Scalar Data Types

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SQL Scalar Data Types Table 6.1 shows the SQL scalar data types defined in the ISO standard. Sometimes, for manipulation and conversion pu...Read More
SQL Scalar Data Types SQL Scalar Data Types Reviewed by Shopping Sale on 00:05 Rating: 5

SQL Identifiers

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SQL identifiers are used to identify objects in the database, such as table names, view names, and columns. The characters that can be used...Read More
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Modifying data in the database (UPDATE)

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Modifying data in the database (UPDATE) The UPDATE statement allows the contents of existing rows in a named table to be changed. The form...Read More
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Database Updates

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Database Updates SQL is a complete data manipulation language that can be used for modifying the data in the database as well as querying ...Read More
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Combining Result Tables (UNION, INTERSECT, EXCEPT) Combining Result Tables (UNION, INTERSECT, EXCEPT) Reviewed by Shopping Sale on 04:21 Rating: 5

EXISTS and NOT EXISTS

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EXISTS and NOT EXISTS The keywords EXISTS and NOT EXISTS are designed for use only with subqueries. They produce a simple true/false resul...Read More
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Computing a join

Shopping Sale 04:17
Computing a join A join is a subset of a more general combination of two tables known as the Cartesian product (see Section 4.1.2). The Ca...Read More
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Multi-Table Queries

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Multi-Table Queries All the examples we have considered so far have a major limitation: the columns that are to appear in the result table...Read More
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ANY and ALL

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The words ANY and ALL may be used with subqueries that produce a single column of numbers. If the subquery is preceded by the keyword ALL, ...Read More
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Subqueries

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Subqueries In this section we examine the use of a complete SELECT statement embedded within another SELECT statement. The results of this...Read More
Subqueries Subqueries Reviewed by Shopping Sale on 04:05 Rating: 5

Grouping Results (GROUP BY Clause)

Shopping Sale 04:02
The above summary queries are similar to the totals at the bottom of a report. They condense all the detailed data in the report into a sin...Read More
Grouping Results (GROUP BY Clause) Grouping Results (GROUP BY Clause) Reviewed by Shopping Sale on 04:02 Rating: 5

Using the SQL Aggregate Functions

Shopping Sale 03:59
Using the SQL Aggregate Functions As well as retrieving rows and columns from the database, we often want to perform some form of summatio...Read More
Using the SQL Aggregate Functions Using the SQL Aggregate Functions Reviewed by Shopping Sale on 03:59 Rating: 5

Sorting Results (ORDER BY Clause)

Shopping Sale 03:57
Sorting Results (ORDER BY Clause) In general, the rows of an SQL query result table are not arranged in any particular order (although som...Read More
Sorting Results (ORDER BY Clause) Sorting Results (ORDER BY Clause) Reviewed by Shopping Sale on 03:57 Rating: 5

Simple Queries

Shopping Sale 03:54
The purpose of the SELECT statement is to retrieve and display data from one or more database tables. It is an extremely powerful command c...Read More
Simple Queries Simple Queries Reviewed by Shopping Sale on 03:54 Rating: 5

Data Manipulation

Shopping Sale 03:49
This section looks at the SQL DML statements, namely: n SELECT – to query data in the database; n INSERT – to insert data into a table; n...Read More
Data Manipulation Data Manipulation Reviewed by Shopping Sale on 03:49 Rating: 5
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