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ER to Relational - Summary IT360: Applied Database Systems ER To Relational
ER to Relational - Summary IT360: Applied Database Systems ER To Relational

... – Specify primary and alternate keys – Specify column types, null status, default values, constraints ...
Nested Queries
Nested Queries

... Specification of Views in SQL (cont’d.) ...
Review
Review

... • Based on the above example: – Customer Id is the foreign key in the Orders table – This is referred to as a One to Many Relationship ...
SQL Commands Lecture
SQL Commands Lecture

... Does not need to be all columns, just those columns specified as not null with no default value ...
More slides on Databases
More slides on Databases

... The SELECT statement A query that returns a table  Simplest form: SELECT column1, column2, … FROM table ...
9-sql
9-sql

... A join lets you collect information from two or more tables and present it as a single table ...
Study Abroad Program Search
Study Abroad Program Search

...  Depends on efficient generation and execution of SQL statement (built from symbol table entries)  pub-cell returns more number of SQL statements than pub-col as for a keyword in column there are multiple entries Ease of maintenance  Insert/Update: required for insertion of distinct new value in ...
Query Joins
Query Joins

... • Data we need for this example is in 2 tables • Summary sales totals have been stored in sales table • If summary figure not stored, you would need also need the sale-inventory relationship table to calculate sales totals • Note: there have been no cash receipts related to sales ...
Exam 2
Exam 2

... ______ Decomposition of a table for normalization results in two or more tables to replace the original table. ______ When rejoining the tables from the decomposition process, tuples are not lost from the original table—it is a lossless join decomposition. ______ 3NF decomposition removes transitive ...
98_364_Slides_Lesson03
98_364_Slides_Lesson03

... – OUTER JOINS can include records from one or both tables you are querying which do not have any corresponding record(s) to be found in the other table. – CROSS JOINS return all rows from the one table with all rows from the other table. WHERE conditions should always be included. ...
Star Schema Optimization - CSCI 6442
Star Schema Optimization - CSCI 6442

... SELECT ... FROM sales WHERE store_key IN (SELECT store_key FROM store WHERE sales_district IN ('WEST', 'SOUTHWEST')) AND time_key IN (SELECT time_key FROM time WHERE quarter IN ('3Q96', '4Q96', '1Q97')) AND product_key IN (SELECT product_key FROM product WHERE department = 'GROCERY'); ...
• Stands for “Structured Query Language” • Essentially a “friendlier
• Stands for “Structured Query Language” • Essentially a “friendlier

... • Remember that SQL is a language within the relational data model — it operates on relational data model constructs using relational operations ...
Document
Document

... attribute. Attributes of population and area can be treated as dimension attributes provided those are discretized properly. For example, consider dimension of population_quartile as a dimension attribute defined on the population column. Top 25 percent of the countries by population get a value of ...
Software Engineering Lecture Slides
Software Engineering Lecture Slides

... LEFT OUTER JOIN (or LEFT JOIN) returns all rows from the first/left table, and the matched rows from the second/right table (i.e., preserves unmatched rows from the left table; fills in nulls as needed) RIGHT OUTER JOIN (or RIGHT JOIN) returns all rows from the right table, and the matched rows from ...
FROM  - WVU CS101
FROM - WVU CS101

... Say we wanted to have it ALIAS a column for us which combined first and last name field values and separated them with a space…  SELECT (first_name + “ ” +last_name) AS [Full Name] FROM customer  Run it! We are presented a field that does not actually exist in the table as we gave it as alias. ...
Outline of topics covered in the Advanced SQL series
Outline of topics covered in the Advanced SQL series

... College of Business, New Mexico State University Databases used in this SQL series:  Human Resources – This is a pre-existing database provided by Oracle when you install Oracle XE.  Student-Teams – This database was created in the SQL Fundamentals series. The DIVISION lesson adds two tables to th ...
Chapter 8
Chapter 8

... • A view is a named, saved query – A virtual table (multiple columns and rows): it can be used wherever a table is expected – Always up-to-date, because it is a query, not a real table – A view’s data is not saved to the database; rather, the SQL query for the view is executed each time it is called ...
Document
Document

... Deletes that table ALTER TABLE ADD ...
Access Queries - University of Nevada, Reno
Access Queries - University of Nevada, Reno

... Design view: Used to structure a query. Referred to as “query by example” or QBE. Result table: The table produced by the query. Shown in the datasheet view. SELECT query window: The window displayed in design view that is filled out to produce a result table. Also called the query design grid. Fiel ...
SQL – The Director`s Cut
SQL – The Director`s Cut

... WHERE h.start_date > TO_DATE('13-JAN-2001', 'dd-MON-yyyy'); ...
SQL - Department of Computer Science
SQL - Department of Computer Science

... Produces numbers, not tables. Not part of relational algebra ...
DBXplorer : A System For Keyword-Based Search Over Relational
DBXplorer : A System For Keyword-Based Search Over Relational

... As mentioned earlier, the Pub-Col alternative is the best when columns have indexes on them. If a full-text index is available, use Pub-Col with the full-text index. Instead, if only a traditional index is available and the column width is small, use Pub-Prefix, otherwise use Pub-Cell. ...
Relationships and JOINS
Relationships and JOINS

... record in tblC has only one matching record in tblP, but a record in tblP can have many matching records in tblC. tblP is called the parent table or primary table and it is the “one” side of the relationship. The linked field in this table must be unique and it is usually the pk. tblC is called the ...
File - Excel
File - Excel

... Foreign Key Advantage 1)It allows refrencing another table using the primary key for the other table What is a join? ...
Exam 2
Exam 2

... ______ A 1NF relation disallows null values and multi-valued attributes. ______ The primary key of a 3NF relation is exactly one attribute. ______ Normalization attempts to identify and then reduce or eliminate redundant facts stored in a database table tuple through decomposition. ______ A lossless ...
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Join (SQL)

A SQL join clause combines records from two or more tables in a relational database. It creates a set that can be saved as a table or used as it is. A JOIN is a means for combining fields from two tables (or more) by using values common to each. ANSI-standard SQL specifies five types of JOIN: INNER, LEFT OUTER, RIGHT OUTER, FULL OUTER and CROSS. As a special case, a table (base table, view, or joined table) can JOIN to itself in a self-join.A programmer writes a JOIN statement to identify the records for joining. If the evaluated predicate is true, the combined record is then produced in the expected format, a record set or a temporary table.
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