Chapter 10
... • When the two tables Cities and Countries from Megacities.accdb are joined based on the foreign key Cities.country, the result is the table in the next slide. • The record for each city is expanded to show its country’s population and its monetary unit. ...
... • When the two tables Cities and Countries from Megacities.accdb are joined based on the foreign key Cities.country, the result is the table in the next slide. • The record for each city is expanded to show its country’s population and its monetary unit. ...
Poor Naming Standards
... the names of the tables that have a one to many relationship with the junction table. Example: You might have "Doctors" and "Patients" tables. Since doctors can have many patients and patients can have many doctors (specialists) you need a table to hold the data for those relationships in a junction ...
... the names of the tables that have a one to many relationship with the junction table. Example: You might have "Doctors" and "Patients" tables. Since doctors can have many patients and patients can have many doctors (specialists) you need a table to hold the data for those relationships in a junction ...
Application Development - Best Practices - Indico
... Its well structured: there are books for both DBAs and developers Some books are strictly technical and some give an overview It is the best source of information for application developers • However the attempt to read it entirely is the best way to fail the ...
... Its well structured: there are books for both DBAs and developers Some books are strictly technical and some give an overview It is the best source of information for application developers • However the attempt to read it entirely is the best way to fail the ...
Slide 1 - UMM Directory
... • Can enter a record in the “one” table, but not in the “many” table if record contains an invalid value for the foreign key • This ensures related tables are consistent with one another. ...
... • Can enter a record in the “one” table, but not in the “many” table if record contains an invalid value for the foreign key • This ensures related tables are consistent with one another. ...
ppt format
... – three types: left outer join, right outer join, and full outer join – left outer join computes the natural join, then takes all tuples (rows) in the left relation that did not match on the join attribute and includes them in the result, with all attributes of the right relation padded with null va ...
... – three types: left outer join, right outer join, and full outer join – left outer join computes the natural join, then takes all tuples (rows) in the left relation that did not match on the join attribute and includes them in the result, with all attributes of the right relation padded with null va ...
Introduction
... • There exists a one to many relationship between ‘departments’ and ‘employees’ • A Foreign Key of the ‘many’ table has values in it that must be in the Primary Key column of the ‘one’ table • This concept is known as Referential Integrity (RI) • We tell the RDBMS how to enforce this integrity in CR ...
... • There exists a one to many relationship between ‘departments’ and ‘employees’ • A Foreign Key of the ‘many’ table has values in it that must be in the Primary Key column of the ‘one’ table • This concept is known as Referential Integrity (RI) • We tell the RDBMS how to enforce this integrity in CR ...
Many-to-Many Relationships
... More database design practice Extends relational database concepts Use AutoNumber to simplify record creation Extends subform and query information for related tables • Create a parameter query • Create queries with built-in aggregate function ...
... More database design practice Extends relational database concepts Use AutoNumber to simplify record creation Extends subform and query information for related tables • Create a parameter query • Create queries with built-in aggregate function ...
Session 5
... matches the query. Same function as the index in a book. Because Primary Keys uniquely identify each row in a table, Primary Keys automatically create Indexes on the same columns within Oracle. This is because, when you want to retrieve data from a table, you will usually have a condition on your da ...
... matches the query. Same function as the index in a book. Because Primary Keys uniquely identify each row in a table, Primary Keys automatically create Indexes on the same columns within Oracle. This is because, when you want to retrieve data from a table, you will usually have a condition on your da ...
PHP Bible – Chapter 16: Displaying Queries in Tables
... Reuse functions in simple cases. The problem of database table display shows up over and over in database-enabled site design. If the display is not complicated, you should be able to throw the same simple function at the problem rather than reinventing the wheel with each PHP page you write Cho ...
... Reuse functions in simple cases. The problem of database table display shows up over and over in database-enabled site design. If the display is not complicated, you should be able to throw the same simple function at the problem rather than reinventing the wheel with each PHP page you write Cho ...
Chapter>>
... Ans: The extended cross product operator can combine any two tables. Other table combining operators have conditions about the tables to combine. Because of its unrestricted nature, the extended cross product operator can produce tables with excessive data. 28. What happens to unmatched rows with th ...
... Ans: The extended cross product operator can combine any two tables. Other table combining operators have conditions about the tables to combine. Because of its unrestricted nature, the extended cross product operator can produce tables with excessive data. 28. What happens to unmatched rows with th ...
lis651p05a-02
... 127 or between 0 to 255. BIT or BOOL are synonyms for the TINYINT. • SMALLINT can hold a number between -32768 and +32767 or 0 and 65535 • INT can hold a number between -2**31 and 2**31-1 or between 0 and 2**32-1. INTEGER is a synonym for INT. • BIGINT can hold a number between -2**63 and 2**61-1 or ...
... 127 or between 0 to 255. BIT or BOOL are synonyms for the TINYINT. • SMALLINT can hold a number between -32768 and +32767 or 0 and 65535 • INT can hold a number between -2**31 and 2**31-1 or between 0 and 2**32-1. INTEGER is a synonym for INT. • BIGINT can hold a number between -2**63 and 2**61-1 or ...
Chapter 5 - Structured Query Language (SQL)
... Example: cannot delete a vendor record if a product references that vendor ON UPDATE CASCADE Example: if a change is made to the vendor code of a specific record, a change will automatically occur to that vendor code on the product table (In Oracle, it’s not necessary to include the ON DELETE ...
... Example: cannot delete a vendor record if a product references that vendor ON UPDATE CASCADE Example: if a change is made to the vendor code of a specific record, a change will automatically occur to that vendor code on the product table (In Oracle, it’s not necessary to include the ON DELETE ...
The Relational Database Model
... A SELECT is performed on the output of the first step to yield only the rows for which the common attribute values match. (Figure 3.13) Common column(s) are called join column(s) ...
... A SELECT is performed on the output of the first step to yield only the rows for which the common attribute values match. (Figure 3.13) Common column(s) are called join column(s) ...
Data Definition Language
... Does not include the data, only the table definition: create table RAIN as select City, Precipitation from TROUBLE where 1=2; ...
... Does not include the data, only the table definition: create table RAIN as select City, Precipitation from TROUBLE where 1=2; ...
dropping tables - Binus Repository
... • We can combine the ID_Num and Phone columns as the Primary Keys for Client_Phone table. • As long as the combination of both columns are always unique. • A key of more than one column is referred by : – Multicolumn Key, or – Composite Key, or – Concatenated Key. ...
... • We can combine the ID_Num and Phone columns as the Primary Keys for Client_Phone table. • As long as the combination of both columns are always unique. • A key of more than one column is referred by : – Multicolumn Key, or – Composite Key, or – Concatenated Key. ...
SQL
... • SQL statements are used both for interactive queries for information from a relational database and for gathering data for reports – SQL uses keywords to interact with databases – It allows creating a database, populating, and querying it – In this slide we learn to apply MySQL Workbench to do all ...
... • SQL statements are used both for interactive queries for information from a relational database and for gathering data for reports – SQL uses keywords to interact with databases – It allows creating a database, populating, and querying it – In this slide we learn to apply MySQL Workbench to do all ...
ppt - CSE, IIT Bombay
... Use of bloom filters can be used to reduce the amount of data rehashed in the SHJ Run a SHJ on the source data projected to only have the hash key and join attributes. Use the results of this mini-join as source for two FM joins to retrieve the other attributes for tuples that are likely to be in th ...
... Use of bloom filters can be used to reduce the amount of data rehashed in the SHJ Run a SHJ on the source data projected to only have the hash key and join attributes. Use the results of this mini-join as source for two FM joins to retrieve the other attributes for tuples that are likely to be in th ...
Creating Databases for Web applications
... • SELECT DISTINCT cname FROM customers as c JOIN orders as o ON c.cid = o.cid WHERE o.date BETWEEN ‘201306-01’ AND ‘2013-08-31’ ...
... • SELECT DISTINCT cname FROM customers as c JOIN orders as o ON c.cid = o.cid WHERE o.date BETWEEN ‘201306-01’ AND ‘2013-08-31’ ...
dbms with answer
... 15)Which two statements about views are true? A) A view can be created as read only. B) A view cannot have an ORDER BY clause in the SELECT statement. C) A view cannot be created with a GROUP BY clause in the SELECT statement. D) A view must have aliases defined for the column names in the SELECT s ...
... 15)Which two statements about views are true? A) A view can be created as read only. B) A view cannot have an ORDER BY clause in the SELECT statement. C) A view cannot be created with a GROUP BY clause in the SELECT statement. D) A view must have aliases defined for the column names in the SELECT s ...
(AC 73) ❖ What is one of the primary benefits of using a database
... Add Fields to the Design Grid (AC 79) Use Text Data in a Criterion (AC 80) Use a Wildcard (AC 83) Use Criteria for a Field Not Included in the Results (AC 85) Create and View a Parameter Query (AC 87) Use a Parameter Query (AC 89) Use a Number in a Criterion (AC 90) Use a Comparison ...
... Add Fields to the Design Grid (AC 79) Use Text Data in a Criterion (AC 80) Use a Wildcard (AC 83) Use Criteria for a Field Not Included in the Results (AC 85) Create and View a Parameter Query (AC 87) Use a Parameter Query (AC 89) Use a Number in a Criterion (AC 90) Use a Comparison ...
(referential integrity, SQL). - Purchase College Faculty Web Server
... • SELECT DISTINCT cname FROM customers as c JOIN orders as o ON c.cid = o.cid WHERE o.date BETWEEN ‘201306-01’ AND ‘2013-08-31’ ...
... • SELECT DISTINCT cname FROM customers as c JOIN orders as o ON c.cid = o.cid WHERE o.date BETWEEN ‘201306-01’ AND ‘2013-08-31’ ...
USING SQL QUERIES TO INSERT, UPDATE, DELETE, AND VIEW
... • Learn how to create database transactions and commit data to the database • Create search conditions in SQL queries • Understand how to update and delete database records, and how to truncate tables • Learn how to create and use sequences to generate surrogate key values automatically • Learn how ...
... • Learn how to create database transactions and commit data to the database • Create search conditions in SQL queries • Understand how to update and delete database records, and how to truncate tables • Learn how to create and use sequences to generate surrogate key values automatically • Learn how ...
Chpt12Lecture
... To limit the number of items that get updated, you use the WHERE clause, just as with selecting data as you saw earlier. Without a WHERE clause, all rows will be affected which is usually not what you want. ...
... To limit the number of items that get updated, you use the WHERE clause, just as with selecting data as you saw earlier. Without a WHERE clause, all rows will be affected which is usually not what you want. ...