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Excel Conditional Logic - Part 2

Excel has a number of logical functions which allows you to set various "conditions" and have data respond to them. For example, you may only want a certain calculation performed or piece of text displayed if certain conditions are met. To start using Functions in Excel you need to
Open Excel => Click in a cell => Click on Insert Menu button =>  Function

To read about If-Else condition click on Excel Conditional Logic - Part 1. Here we will be talking about AND, OR and NOT Condition

AND CONDITION


This function is a logical test to see if all conditions are true. If this is the case, the value "TRUE" is returned. If any of the arguments in the AND statement are found to be false, the whole statement produces the value "FALSE". This function is particularly useful as a check to make sure that all conditions you set are met. Arguments are entered in the AND statement in parentheses, separated by commas, and there is a maximum of 30 arguments to one AND statement. The following example checks that two cells, B1 and B2, are both greater than 100.
=AND(B1>100,B2>100)

If either one of these two cells contains a value less than a hundred, the result of the AND statement is
"FALSE”. This can now be wrapped inside an IF function to produce a more meaningful result. You may want to add the two figures together if they are over 100, or display a message indicating that they are not high enough.
=IF(AND(B1>100,B2>100),B1+B2,"Figures not high enough")

OR CONDITION

   

This function is a logical test to see if one or more conditions are true. If this is the case, the value "TRUE" is returned. If just one of the arguments in the OR statement is found to be true, the whole statement produces the value "TRUE". Only when all arguments are false will the value "FALSE" be returned. This function is particularly useful as a check to make sure that at least one of the conditions you set is met.
=IF(OR(B1>100,B2>100),"at least one is OK","Figures not high enough")

In the above formula, only one of the numbers in cells B1 and B2 has to be over 100 in order for them to be
added together. The message only appears if neither figure is high enough.

NOT CONDITION


NOT checks to see if the argument is false. If so, the value "TRUE" is returned. It is best to use NOT as
"provided this is not the case" function. In other words, so long as the argument is false, the overall statement is true. In the example, the cell contents of B1 are returned unless the number 13 is encountered. If B1 is found to contain 13, the message "Unlucky!" is displayed;
=IF(NOT(B1=13),B1,"Unlucky!")

The NOT function can only contain one argument. If it is necessary to check that more than one argument is false, the OR function should be used and the true and false values of the IF statement reversed. Suppose, for example, a check is done against the numbers 13 and 666;
=IF(OR(B1=13,B1=666),"Unlucky!",B1)
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