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#### FlatAssembler

• 607
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« on: May 25, 2022, 04:55:15 AM »
In 2018, on a test about databases (which I have failed multiple times) at my university, they had this task:
Quote
Napisati T-SQL funkciju koja prima 3 realna broja, te kao rezultat vraća onaj broj koji ima najveću apsolutnu vrijednost. Ako slučajno istu najveću apsolutnu vrijednost imaju dva ili tri broja potrebno je vratiti zbroj tih brojeva.
That is:
Quote
Write a T-SQL function that accepts 3 real numbers, and as a result it returns the number that has the biggest absolute value. If accidentally the same biggest absolute value is had by two or three numbers it is necessary to return the sum of those numbers.
How would you solve that?
Here is my attempt, I do not know if it is correct nor how to actually test it on my computer:
Code: [Select]
`CREATE FUNCTION max_abs3(@x, @y, @z DECIMAL) RETURNS DECIMALBEGIN    IF ABS(@x)=ABS(@y) AND ABS(@y)=ABS(@z)    BEGIN        RETURN @x+@y+@z;    END;    IF ABS(@x)=ABS(@y) AND ABS(@x)>ABS(@z)    BEGIN        RETURN @x+@y;    END;    IF ABS(@x)=ABS(@z) AND ABS(@x)>ABS(@y)    BEGIN        RETURN @x+@z;    END;    IF ABS(@y)=ABS(@z) AND ABS(@y)>ABS(@x)    BEGIN        RETURN @y+@z;    END;    IF ABS(@x)>ABS(@y) AND ABS(@x)>ABS(@z)    BEGIN        RETURN @x;    END;    IF ABS(@y)>ABS(@z) AND ABS(@y)>ABS(@x)        RETURN @y;    END;    RETURN @z;END;`I have only managed to install SQLite on my computer, and it apparently does not support custom SQL functions.
Fan of Stephen Wolfram.
This is my parody of the conspiracy theorists:
https://www.theflatearthsociety.org/forum/index.php?topic=71184.0

#### NotSoSkeptical

• 7503
• Flatness as in the shape of a water droplet.
##### Re: A question about databases
« Reply #1 on: May 25, 2022, 05:26:46 AM »
In 2018, on a test about databases (which I have failed multiple times) at my university, they had this task:
Quote
Napisati T-SQL funkciju koja prima 3 realna broja, te kao rezultat vraća onaj broj koji ima najveću apsolutnu vrijednost. Ako slučajno istu najveću apsolutnu vrijednost imaju dva ili tri broja potrebno je vratiti zbroj tih brojeva.
That is:
Quote
Write a T-SQL function that accepts 3 real numbers, and as a result it returns the number that has the biggest absolute value. If accidentally the same biggest absolute value is had by two or three numbers it is necessary to return the sum of those numbers.
How would you solve that?
Here is my attempt, I do not know if it is correct nor how to actually test it on my computer:
Code: [Select]
`CREATE FUNCTION max_abs3(@x, @y, @z DECIMAL) RETURNS DECIMALBEGIN    IF ABS(@x)=ABS(@y) AND ABS(@y)=ABS(@z)    BEGIN        RETURN @x+@y+@z;    END;    IF ABS(@x)=ABS(@y) AND ABS(@x)>ABS(@z)    BEGIN        RETURN @x+@y;    END;    IF ABS(@x)=ABS(@z) AND ABS(@x)>ABS(@y)    BEGIN        RETURN @x+@z;    END;    IF ABS(@y)=ABS(@z) AND ABS(@y)>ABS(@x)    BEGIN        RETURN @y+@z;    END;    IF ABS(@x)>ABS(@y) AND ABS(@x)>ABS(@z)    BEGIN        RETURN @x;    END;    IF ABS(@y)>ABS(@z) AND ABS(@y)>ABS(@x)        RETURN @y;    END;    RETURN @z;END;`I have only managed to install SQLite on my computer, and it apparently does not support custom SQL functions.

Get Microsoft SQL Express.  It's free
I would also write it using SQL CASE.  https://www.w3schools.com/sql/sql_case.asp
« Last Edit: May 25, 2022, 05:31:07 AM by NotSoSkeptical »
Rabinoz RIP

#### JimmyTheCrab

• 10340
##### Re: A question about databases
« Reply #2 on: May 25, 2022, 06:24:14 AM »

The other way you could do it is with CASE WHEN statements

CASE
WHEN condition1 THEN result1
WHEN condition2 THEN result2
WHEN conditionN THEN resultN
ELSE result
END;

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#### boydster

• Assistant to the Regional Manager
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##### Re: A question about databases
« Reply #3 on: May 25, 2022, 01:47:15 PM »
Barring the other very fine suggestions, you could also do it in MySQL/MariaDB. It's FOSS, all it costs you is time and storage space.