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How is indexing faster than sorting when accessing data from a table?
Indexing can be faster than sorting. It can also be slower. It depends on how many rows your predicate clause is selecting, and on the data dispersion represented by those index keys. If you are selecting a few rows, such as less than 4% of the table, then by all means use an index. If you are selecting a lot of rows, such as more than 25% of the table, then the use of the index will usually degrade performance, so go for the full table scan followed by a sort. (Of course, now you are adding the use of sort space, so that is a consideration.) The break-even point depends on the particular RDBMS and on the structure of the data. If your RDBMS supports EXPLAIN PLAN, then use it, and learn to know what it means. Also, make sure you understand your data, because (sometimes) only you know the best way to query it, and it might make sense to override the optimzer and force a certain execution plan based on your knowledge.
The advantages and disadvantages of primary data?
Advantages and Disadvantages of primary data are: Advantages 1. Data is basic 2. Unbiased information 3. Original data 4. Data from the primary market/ population 5. Data direct from the population. Disadvantages. 1. Large volume of data. 2. Huge volume of population. 3. Time consuming 4. Direct and personal intervention has to be there. 5. Raw data.
What is a continuous and discrete data set?
time to learn a song for 4 hours, is this discrete or continuous data set?
What is the range of the given data set -4 -3 -1 -1 0 1?
To find the range of a data set, you first need to order the data from smallest to largest. In this case, the data is already ordered in such a way. The next step is to take the least (-4) and greatest (1) numbers, and subtract the least from the greatest. In this case, we'd do 1-(-4) which equals 5. Thus the range of the data set in the question is 5.
How are mean and median alike?
The mean of a set of data is all the values in that data added together and then divided by the number of values. For instance, if you had the data set 1, 3, 4, 6, 8, you would add them all up to get 22, and then divide by 5 to get 4.4 which is the mean. The median is the middle value of all data values. In the above data set, that is 4, and so 4 would be the median. Mean and median are alike in that they both attempt to find the "middle" of the data, and are both considered averages.
What are the release dates for Poker After Dark - 2007 Dream Table Part 4 3-4?
Poker After Dark - 2007 Dream Table Part 4 3-4 was released on: USA: 3 January 2008
How many columns and rows does a table have?
A table in a database can have multiple columns (fields) and multiple rows (records). The number of columns and rows in a table can vary depending on the database design and the amount of data being stored.
What are the main parts of a Landsat satellite what is the function of each part?
Four main parts are 1. mapper 2. antenna 3. communications 4. data handling module functions: mapper- gathers detailed data about a strip of Earths surface. antenna- Landsat 5 then sends the data to a Landsat ground station solar panels- contains the mapper, antenna communication and data handling module
What is the main function of part 4?
It is the sequel of Part 3, also the prequel of Part 5.
Craft a crafting table Part,4?
Then on the other side you will see a different thing
What are the release dates for Poker After Dark - 2007 Dream Table Part 5 3-5?
Poker After Dark - 2007 Dream Table Part 5 3-5 was released on: USA: 4 January 2008
Write a short note on table creation?
table is created to store the information in rows and coloums in table creation it consist of two types cell spacing cellpadsing cell spacing is define as the distance between two cell cell pading is define as the distance between cell and the wall the creation of table <tr> the creation of table heading is <th> to create a row <td> an example program <table> <tr> <th>heading 1</th> <th>heading 2</th> </tr> <td>data 1</td> <td>data 2</td> </tr> <tr> <td>data 3</td> <td>data 4</td> </tr> </table>
What are the main parts of a Landsat satellite and what is the function of each part?
Four main parts are 1. mapper 2. antenna 3. communications 4. data handling module functions: mapper- gathers detailed data about a strip of Earths surface. antenna- Landsat 5 then sends the data to a Landsat ground station solar panels- contains the mapper, antenna communication and data handling module
Is assassins creed revelations part of the main series or a totally different one?
Part of the main series. It picks up some 4 years after Brotherhood finishes.
What are the 4 main Ribbon tabs?
The four main ribbon tabs in Microsoft Office 2007 and 2010 are Home, Create, External Data, and Database Tools.
What are the four phases of data processing?
1. Import 2. Sanitize'; DROP TABLE ANSWERS; -- 3. ???? 4. DELETE
Is 147 in the 4 times table?
No but 148 is in the 4 times table
