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It will depend on the design of your table and your query. If you have done something like brought the table in twice into the design of the query you will get multiple records. There are occasions when you would need to bring in the same table twice, but usually you don't. If you have it in twice it will list records multiple times. Go to the design view of the query and if you see the table there more than once, delete the extra copies of it, so that there is only one. Then design your query and it should be ok.
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What is the cost of a sort merge join operation in a database query?
The cost of a sort merge join operation in a database query is determined by the time it takes to sort the input data sets and merge them together. This process can be computationally expensive, especially for large data sets, resulting in higher processing times and resource usage.
How do you insert 10000 rows to mysql in php?
The same way you insert 1 row, just 10,000 times. There are two choices, I'm going to assume you've already connected to mysql and you are prepared to run your query: 1. Transactional method: $query = "INSERT INTO foo (column) VALUES (row1), (row2), (row3) ... (row10000);"; mysql_query($query); This is ideal when it is imperative that all rows go into the database. Keep in mind that this method will tie up the database until the entire query is completed. 2. Separate queries $query = "INSERT INTO foo (column) VALUES (row1); INSERT INTO foo (column) VALUES (row2); ... INSERT INTO foo (column) VALUES (row10000);"; mysql_query($query); This method will allow other queries to run along side and will not necessarily tie up the database, if it's ok if some rows fail this method is probably ideal.
What is blank database in MS Access?
When you create a new database it is blank or based on a template. You can choose to base one on a template in which case there will already be some things in it, like tables that are in the database that you can use as a starting point. You may want to do this sometimes for a standard kind of a database. Other times the database you are creating is not like any other, so you would start with a blank one and create all the elements yourself.
Accessing disk storage is slower than accessing RAM by an order of?
RAM is 100 Thousand Times Faster than Disk for Database Access
How many times does equal appear in the bible?
Simple...just access Strongs Exhaustive Concordance on line and count the references
Why are attributes of tables in a database often accessed together?
For performance reasons, i.e., since you have already taken the hit to locate a row (presumably using a where clause) you might as well get all the information needed at once. If on the other hand you query multiple times your application will be very slow.
How many times word despise appear in Bible?
Simple...just access Strongs Exhaustive Concordance on line and count the references
What are views?
A database view is a logical table query that permits the database architect to create a special view of data without having to have a larger complex query used each time. This makes the query run faster than even using prepared statements. For example, you might create a view to show the last 10 blog posts, which would allow you to simply say: select * from `last_10_posts` instead of select * from post order by post_date desc limit 10 where public = true and owner_id = 5 As you can see, using a view can greatly the preparation time of a query, and also allows you to change the implementation of the underlying view without having to go to each place where that query takes place and update the code multiple times.
What are objectives query processing optimization?
main objective is to retrieve data quickly. Query optimization is the refining process in database administration and it helps to bring down speed of execution. Most of the databases after are built and filled with data, and used come down on speed. The time taken to execute a query and return results exponentially grows as the amount of data increases in the database leading to more waiting times on the user, and application sides. Sometimes the wait times could range from minutes, to hours, and days as well in worst cases. Technically one of the reasons of slow speeds of executions could be excess normalization leading to multiple tables. More the number of tables, more is the complex nature of joins, and thus leading to more execution times. Sometimes, the complex nature of joins could worse the situation by bring the execution into deadlock.
Does the Seattle Times have an onine searchable database?
The Seattle Times does have a searchable database, with many advanced search options. It also has a historical archive online searchable database, like most news papers.
How many times does the word love appear in the new international version bible?
Simple...just access Strongs Exhaustive Concordance on line and count the references
How many times does love loved loves appear in the new international version bible?
Simple...just access Strongs Exhaustive Concordance on line and count the references
