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I'd like to limit my query to show only rows where a certain field is not empty. I found this thread where someone posed the same question and was told to use IS NOT NULL. I tried that, but I'm still getting rows where the field is empty.
What is the correct way to do this? Is Null the same thing as Empty in SQL/MySQL?
My query, if you're interested is:
SELECT * FROM records WHERE (party_zip='49080' OR party_zip='49078' OR party_zip='49284' ) AND partyfn IS NOT NULL
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The IS NULL constraint can be used whenever the column is empty and the symbol ( ' ') is used when there is empty value. mysql> SELECT * FROM ColumnValueNullDemo WHERE ColumnName IS NULL OR ColumnName = ' '; After executing the above query, the output obtained is.
The IS NOT NULL condition is used in SQL to test for a non-NULL value. It returns TRUE if a non-NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
Sometimes strings can be empty or NULL. The difference is that NULL is used to refer to nothing. However, an empty string is used to point to a unique string with zero length.
@NotNull: a constrained CharSequence, Collection, Map, or Array is valid as long as it's not null, but it can be empty. @NotEmpty: a constrained CharSequence, Collection, Map, or Array is valid as long as it's not null, and its size/length is greater than zero.
I got it by using AND (partyfn IS NOT NULL AND partyfn != '')
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