slides
... SELECT column1, column2, etc. – columns you want to display FROM table1, table2, etc. – tables that contain the data WHERE condition1 – which records (i.e., rows) to retrieve AND condition2 etc – you can combine more than one condition using AND or OR ...
... SELECT column1, column2, etc. – columns you want to display FROM table1, table2, etc. – tables that contain the data WHERE condition1 – which records (i.e., rows) to retrieve AND condition2 etc – you can combine more than one condition using AND or OR ...
Distributed Databases - Computer Science, Stony Brook University
... day, which might clog the network – If we replicate, the time to register a new customer might suffer because of the remote update • But this update can be done by a separate transaction after the registration transaction commits (asynchronous update) ...
... day, which might clog the network – If we replicate, the time to register a new customer might suffer because of the remote update • But this update can be done by a separate transaction after the registration transaction commits (asynchronous update) ...
File
... • 3. Identify those columns that need to be UNQUE - when the data in that column must have a different value (no duplicates) for each row of data within that table. Where a column or set of columns is designated as UNIQUE, this is a candidate key. Only one candidate key may be designated as a PRIMAR ...
... • 3. Identify those columns that need to be UNQUE - when the data in that column must have a different value (no duplicates) for each row of data within that table. Where a column or set of columns is designated as UNIQUE, this is a candidate key. Only one candidate key may be designated as a PRIMAR ...
Slide 1
... • The goal for the DB2 for i5/OS optimizer is to produce a plan that will allow the query to execute in the shortest time period possible • Optimization is based on time, not on resource utilization • The DB2 for System i Optimizer performs "cost based" optimization • "Cost" is defined as the estima ...
... • The goal for the DB2 for i5/OS optimizer is to produce a plan that will allow the query to execute in the shortest time period possible • Optimization is based on time, not on resource utilization • The DB2 for System i Optimizer performs "cost based" optimization • "Cost" is defined as the estima ...
Chapter 8
... Bitmap identifies rows of a related table. Represents a precomputed join Can define for a join column or a non-join column Typically used in query dominated ...
... Bitmap identifies rows of a related table. Represents a precomputed join Can define for a join column or a non-join column Typically used in query dominated ...
Final Exam Review
... 1. Which identifiers listed below are invalid names within the Oracle database? ...
... 1. Which identifiers listed below are invalid names within the Oracle database? ...
MS_Access
... • The rules associated with referential integrity specify that when you add a record to a related table, there must be a matching record in the primary table. • If you choose to enforce referential integrity, you can insure that you will not have orphaned records (records that have no matching recor ...
... • The rules associated with referential integrity specify that when you add a record to a related table, there must be a matching record in the primary table. • If you choose to enforce referential integrity, you can insure that you will not have orphaned records (records that have no matching recor ...
Exam 2 Concept Review
... department_id that does not exist. You also want to delete the old department id. There is a foreign key for department_id on your employees table that references the primary key in the departments table. What DML operations are needed? a. An insert to departments, an update on employees, a delete o ...
... department_id that does not exist. You also want to delete the old department id. There is a foreign key for department_id on your employees table that references the primary key in the departments table. What DML operations are needed? a. An insert to departments, an update on employees, a delete o ...
create table - dbmanagement.info
... Join queries almost always involve matching the primary key of the dominant (parent) table with the foreign key of the dependent (child) table. ...
... Join queries almost always involve matching the primary key of the dominant (parent) table with the foreign key of the dependent (child) table. ...
PowerPoint 97
... CREATE [UNIQUE] [CLUSTERED | NONCLUSTERED] INDEX table_name_idx ON table_name (column [,…]) ...
... CREATE [UNIQUE] [CLUSTERED | NONCLUSTERED] INDEX table_name_idx ON table_name (column [,…]) ...
ProgrammingMSSQL2012
... 1. “Show me all customers, and their purchases for the month” 2. “Show me all products, and their profit last week” ...
... 1. “Show me all customers, and their purchases for the month” 2. “Show me all products, and their profit last week” ...
Programming Microsoft SQL Server
... 1. “Show me all customers, and their purchases for the month” 2. “Show me all products, and their profit last week” ...
... 1. “Show me all customers, and their purchases for the month” 2. “Show me all products, and their profit last week” ...
Programming Microsoft SQL Server
... 1. “Show me all customers, and their purchases for the month” 2. “Show me all products, and their profit last week” ...
... 1. “Show me all customers, and their purchases for the month” 2. “Show me all products, and their profit last week” ...
Document
... EquiJOIN links tables based on an equality condition that compares specified columns of each table. The outcome of the EquiJOIN does not eliminate duplicate columns and the condition or criteria to join the tables must be explicitly defined. ...
... EquiJOIN links tables based on an equality condition that compares specified columns of each table. The outcome of the EquiJOIN does not eliminate duplicate columns and the condition or criteria to join the tables must be explicitly defined. ...
Using SQL to create tables
... Note also, if you want to put an apostrophe in a string, put in two apostrophes. ...
... Note also, if you want to put an apostrophe in a string, put in two apostrophes. ...
What is XML? - Pennsylvania State University
... Lesson 4: Using SELECT queries Lesson 5: Using INSERT queries Lesson 6: Using UPDATE queries Lesson 7: Using Delete queries ...
... Lesson 4: Using SELECT queries Lesson 5: Using INSERT queries Lesson 6: Using UPDATE queries Lesson 7: Using Delete queries ...
Distributed Databases - Computer Science, NMSU
... – The Customer relation has 100,000 rows – The headquarters mailing application sends each customer one mailing a month – 500 deliveries are made each day, and a single row must be read for each delivery – There are 100 new customers a day (and changes to customer information occur negligibly often) ...
... – The Customer relation has 100,000 rows – The headquarters mailing application sends each customer one mailing a month – 500 deliveries are made each day, and a single row must be read for each delivery – There are 100 new customers a day (and changes to customer information occur negligibly often) ...
Logic: Basic Defintions
... – Can also use HAVING clause to further condition inclusion in groups • Use HAVING only with GROUP BY, never as a substitute for WHERE ...
... – Can also use HAVING clause to further condition inclusion in groups • Use HAVING only with GROUP BY, never as a substitute for WHERE ...
Databases
... SELECT statements carry out queries INSERT, UPDATE, and DELETE statements affect the database In Java/JDBC, use the Statement and ...
... SELECT statements carry out queries INSERT, UPDATE, and DELETE statements affect the database In Java/JDBC, use the Statement and ...
Review for Final Exam
... --depends on group by [order by] ;
includes aggregates: avg, min, max, sum, count
can have derived relation --subquery assigned name with as
select <> from <> where<> as r1
where
... --depends on group by [order by
