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Data from two or more tables can be connected by specifying a?
Wiki User
∙ 12y ago
field value.
Wiki User
∙ 12y ago
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How do graphs clarfity data?
Data in its raw form is difficult to understand - often it is nothing more than long lists of values for particular variables that were studied. Graphs (and charts, and tables, and similar things) present that data in a visual form so that patterns and relationships are easily and immediately apparent.
How do you calculate the feeder size for two or more three phase air condition?
Feeder sizes are based on the amperage of the connected load. Once that is found there are tables in the electrical code book that state what the wire size is for that particular amperage.
Why is database normalisation necessary?
Database normalization is necessary to eliminate data redundancy and ensure data integrity and consistency. By organizing data into multiple related tables and reducing duplication, normalization helps to save storage space and improve the efficiency of data retrieval and update operations. It also prevents anomalies, such as update anomalies and insertion anomalies, by ensuring that each piece of data is stored in only one place.
What is difference between natural join equijoin and outer join?
Equijoin - Joins two or more tables where the specified columns are equal. Returns only those records found in both tables. Outer join - Joins two or more tables on the specified columns, returning all the values from table 1 regardless of whether they are in table 2. Natural Join - Joins two tables on all like column names.
What is the difference between tombolo from the peninsula?
I am not entirely sure, but I think it may have to do with the connecting mass. Tombolos are usually connected by a sandbar, which is more prone to geographical effects and can be more effected by waves and tides. Peninsulas are connected by more "solid" land masses such as solid ground that are not as prone to being shifted around. Also, peninsulas have to be connected to a mainland, whereas tombolos can be connected to other islands as well as a mainland.
How do related tables improve the accuracy of a data in a database?
In short, they do not. Relating tables in a database defines the relationships between the data sets in the different tables and allows the data to be accessed more efficiently, but it does not affect the accuracy of the data entered.
How does displaying data in tables or graphs help us identify pattern?
Tables and graphs allow data to be more easily understood visually.
Clarify how to use data tables?
We need more details for an answer.
What is the benefit of dividing a database into tables?
Tables organize the data into a form that can be referenced from two or more inputs.
What is the purpose of relating tables in a database?
to calculate data more effectively
What is the advantage of denormalization over normalization?
If you meant disadvantage of normalization then these are the answer for your query. More tables to join: By spreading out your data into more tables, you increase the need to join tables. Tables contain codes instead of real data: Repeated data is stored as codes rather than meaningful data. Therefore, there is always a need to go to the lookup table for the value. Data model is difficult to query against: The data model is optimized for applications, not for ad hoc querying.
A database object that retrieves specific data from one of more tables is a what?
A database object that retrieves specific data from one or more tables is called a query. Queries are used to extract information from databases based on specified criteria and are essential for data manipulation and reporting purposes.
What is database object that retrieves specific data from one or more tables and then displays only the data you specified?
Query
What are the advantages of de-normalized data?
1. We can retrieve the data from tables using less number of joins. 2. The data is more centralized.
A database object that retrieves specific data from one or more tables and then displays the specified data in Datasheet view is a?
Query
What are tables and graphs used for?
To summarise data and present them in a form that are more easily understood.
A database object that retrieves specific data from one or more tables?
A stored procedure is a database object that retrieves specific data from one or more tables by executing a pre-defined set of SQL statements. It can accept input parameters, process the data in a controlled manner, and return the desired result set for use in applications or reports. Stored procedures help improve performance, maintain data integrity, and simplify complex queries in a database system.
