COMPUTER APPLICATION
LIT
ALL I NEED TO KNOW
EXCEL
FUNCTIONS:
BASICS:
1. =SUM(RANGE): adds all the number is a range
2. =MIN(RANGE): finds the smallest digit
3. =MAX(RANGE): finds the biggest digit
4. =AVERAGE(RANGE): finds the average digit
5. =MEAN(RANGE): finds the digits that appears the most
6. =RAND(): randomly obtains a value between zero and
one
7. =RANDBETWEEN(LOWER,UPPER): chooses a value
between the smallest (lower) number and the biggest
(upper) number
Example: =RANDBETWEEN(10,5) chooses a random number
between 5 and 10 including 5 and 10
Example: =RANDBETWEEN(10,99) chooses a random number
between 10 and 99 including 10 and 99 obtaining two digits.
ADVANCE:
1. =SMALL(RANGE, CONDITION):
finds the nth smallest value in a range.
Example: if you have a list of numbers and you want to
find the second smallest value, you can use the small
function.
So, if you enter =small(A1;A10,2). Excel will return the
second smallest value from A1 to A10
This works the same way with the
=LARGE(RANGE,CONDITION)
2.COUNT FUNCTIONS:
2.1. **COUNT**:
This function counts the number of cells that contain
numbers within a specified range.
Example: `=COUNT(A1:A10)` will count how many cells in
the range A1:A10 contain numbers.
2.2. **COUNTA**:
This function counts the number of non-empty cells within
a specified range, including cells with text, numbers,
errors, or logical values.
Example: `=COUNTA(A1:A10)` will count how many
cells in the range A1:A10 are not empty.
2.3. **COUNTIF**:
This function counts the number of cells within a range
that meet a specified condition.
Example: `=COUNTIF (A1:A10, ">50")` will count how
many cells in the range A1:A10 contain values greater
than 50.
2.4. **COUNTIFS**:
Similar to COUNTIF, but it allows you to specify multiple
criteria.
Example: `=COUNTIFS(A1:A10, ">50", B1:B10, "<100")`
will count how many cells in the range A1:A10 contain
values greater than 50 in column A and less than 100 in
column B.
2.5. **COUNTBLANK**:
This function counts the number of empty cells within a
specified range.
Example: `=COUNTBLANK(A1:A10)` will count how many
cells in the range A1:A10 are empty.
3. DATE FUNCTIONS:
3.1. **TODAY()**:
This function returns the current date. It doesn't require
any arguments.
Example: `=TODAY()` will return today's date.
3.2. **NOW()**:
Similar to TODAY(), this function returns the current
date and time.
Example: `=NOW()` will return the current date and
time.
3.3. **DATE(year, month, day)**:
This function constructs a date from the specified
year, month, and day.
Example: `=DATE(2024, 4, 13)` will return the date
April 13, 2024.
3.4. **YEAR(serial number)**,
**MONTH(serial_number)**, **DAY(serial_number)**:
These functions extract the year, month, and day
from a given date.
Example:
- `=YEAR(A1)` will return the year from the date in cell
A1.
- `=MONTH(A1)` will return the month from the date in
cell A1.
- `=DAY(A1)` will return the day from the date in cell
A1.
3.5. **DATEDIF(start_date, end_date, unit)**:
This function calculates the difference between two
dates in terms of years, months, or days.
Example: `=DATEDIF(A1, A2, "Y")` will return the
number of complete years between the dates in cells A1
and A2.
3.6. **EOMONTH(start_date, months)**:
This function returns the last day of the month, a
specified number of months before or after a given
date.
Example: `=EOMONTH(A1, 3)` will return the last day
of the month that is 3 months after the date in cell A1.
ACCESS/DATABASE
WORKING WITH TABLES:
DATA TYPE
Short text
USAGE
 Names & surnames
 Addresses & company names
 Series of digits
Long text
 Text entries longer than 255 characters
e.g. comments, explanations
Number
 Mathematical calculations e.g. amount
Date/Time
 Dates and Times only
 Can be in short, medium, or long
formats.
Currency
 Monetary values
Auto Numbers
 Sequential numbers beginning at 1and
are unique.
Yes/No
 YES= ON=TRUE=-1
 NO=OFF=FALSE=0
OLE Object
Hyperlink
Attachment
 Mainly for photos, videos, and music
 Used/created with another app
 Blue+underlined
 Supports more file types.
 Attaches more than one file to a field.
INPUT MASK:
General (default)
Input Mask Character
0
Description
 Entry required.
 Digits 0 to 9
9
 Entry not required
 Any digit or space
 Plus, and minus are allowed
#
 Entry not required
 Any digit or space
 Plis and minus allowed
L
 Entry required
 Letters A-Z
?
 Entry optional
 Letters A-Z
A
 Entry required
 Letter or digit
&
 Entry optional
 Any character or space
<
 Causes all characters to
convert to lower case
>
 Causes all characters to
convert to upper case
WORKING WITH QUERIES:
(NUMBERS)
Operations:
=
;
<
;
;
>
;
>=
;
<=
#
Number
>30, test if the values of the
field is greater than 30
>=100, test if the values of the
field is greater than or equal to
100
<30, tests if the values of the
field is less than 30
<=100, tests if the values of the
field is less or equal to 100
Date / Time
=#16/10/2011#, test if the date
is 16 October 2011
>=#15/09/2022#, test for dates
after 15 September 2022
(TEXT)
Operations:
Numbers
AND
;
OR
;
NOT
>30 AND <40
Test if the values at the field is greater
than 30 and less than 40
( between 30 and 40)
Text
> “C” AND < “K”
Tests contents of the field with C
to J
“Green” OR “Pink”
Tests contents if it is green or
pink
NOT “Green”
Test if the contents have anything
not green
Date / Time
>=#01/01/2018# AND
<=#31/12/2018#
Tests for dates in 2018
=#16/06/2018# OR =#04/08/2018#
Tests for dates which are either 16
Junes 2018 or 04 August 2018
NOT #29/01/2018#
Tests for any dates either than 29
January 2018