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Answer:
The expression is :
π[cd) + π(g,h) ],[π(e,f)+π(a,b)])
We will use foreign key and primary key
Answer:
A pre-programmed function is a section of code which is reusable to perform certain routine. One benefit of using a pre-programmed function to analyze data is the code redundancy can be reduced. The function is only written for once and it can be called to perform a specific data analysis whenever it is needed.
Besides, a pre-programmed function also offer consistent analytical output as all data are processed by a same analytical procedure in the function.
Answer: Limits the row data that are returned.
Explanation: In structured query language (SQL), The where clause is used as a filter. The filter is applied to a column and as such the filter value or criteria determines the values that are spared in the column on which the WHERE clause is applied. All rows in which the column value does not meet the WHERE clause criteria are exempted from the output. This will hence limit the number of rows which our command displays.
For instance,
FROM * SELECT table_name WHERE username = 'fichoh' ;
The command above filters the username column for username with fichoh, then displays only rows of Data with fichoh as the username. All data columns are displayed but rows of data which do not match fichoh are exempted.
Selection is the step in algorithm that let's the computer decide which group of steps to perform.
<h3>What is Algorithm?</h3>
This can be defined as set of instructions which are used for solving a problem or accomplishing a task.
Selection happens when there are one or more options are available in which the computer decide which group of steps to perform.
Read more about Algorithm here brainly.com/question/11302120
