ignoring missing values in percentage calculations-ms access query

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i have a table called info with 3 fields namely;

Name   totalvisits   specialvisits
mmm    30            15
kkk    49            49
jjj    60            30
mu     40            -99
jh     -99           -99

-99 denotes missing values, I want to calculate percentage of specialvisits to totalvisits. here is what my expression in ms access;

percentage special visit:[info].[specialvisits]/[info].[totalvisits]*100

It is giving me the correct answers for all values where there no missing data.how will my expression be like so that it disregard the missing values.

Posted 12-Aug-12 23:51pm

mayeso

Updated 12-Aug-12 23:54pm

StianSandberg

v2

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Maciej Los · Accepted Answer · 2013-04-14T22:32:00

Solution 1

Use WHERE statement in your query:

SQL

SELECT [Name], [totalvisits], [specialvisits],  [totalvisits]/[specialvisits] * 100 AS Percentage
FROM info
WHERE  ([totalvisits]>0) AND ([specialvisits]>0);

Posted 14-Apr-13 22:32pm

Maciej Los