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mysqlsqlselectquery-optimization

Checking multiple columns for one value


I have a table that has columns like this for example:

id,col1,col2,col3,col4

Now, I want to check if ANY of col1, col2, col3, col4 have the passed in value.

The long way to do it would be..

SELECT * FROM table WHERE (col1 = 123 OR col2 = 123 OR col3 = 123 OR col4 = 123);

I guess it's the opposite version of IN.

Is there an easier way to do what I want?


Solution

  • You can use the IN predicate, like so:

    SELECT * FROM table WHERE 123 IN(col1, col2, col3, col4);
    

    SQL Fiddle Demo


    it's the opposite version of IN.

    No it is not, It is the same as using the ORs the way you did in your question.


    To clarify this:

    The predicate IN or set membership is defined as1:

    enter image description here

    Where the Value Expression can be either 2:

    enter image description here

    So it is fine to do it this way, using the value expression 123, which is a literal.


    1, 2: Images from: SQL Queries for Mere Mortals(R): A Hands-On Guide to Data Manipulation in SQL