Silly Question, Probably

Is there any difference between a null value and a value created by a space bar entry? In other words, if you could see a single byte void of any value (null) and a single byte blanked? by a space bar entry, would they be interpreted any differently by the data base and or its functions? I seem to be getting different results when a data entry person spaces before tabbing out of a field or inadvertently spaces before entry in a text field.

Hi,
Yes: there's all the difference in the world. Within a text column or field, a space is treated like any other character. SQL will not treat a string that consists of a single space like a NULL, any more than it would treat a string that consists of a single 'Y' like a NULL.
Many of front-end applications use functions like TRIM or REGEXP_REPLACE to remove spaces at the beginning or end of a field before inserting them into the database. That way, whether the user inadvertently types a space or not, NULL will go into the database. You could do the same thing in a BEFORE INSERT trigger.

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