Examples of using Zero-length in English and their translations into Slovak
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Programming
Format for fields with zero-length strings and Null values.
You must do this becauseAccess interprets a single pair of brackets as a zero-length string.
Allows entry(by setting to Yes) of a zero-length string("") in a Hyperlink, Text, or Memo field.
If there is no environment string in the specified position,Environ returns a zero-length string.
If delimiter is a zero-length string(""), all items in the list are concatenated with no delimiters.
When you use the& operator on a field that has no value,Access returns a zero-length string for that field.
A zero-length string contains no characters, and you use them to indicate that you know no value exists for a field.
You must do this becauseAccess interprets a single pair of brackets as a zero-length string.
You can use the Nz function to return zero, a zero-length string(""), or another specified value when a Variant is Null.
A zero-length string contains no characters, and you use them to indicate that you know no value exists for a field.
A null fieldis not the same as a field that contains a zero-length string("") or a field with a value of 0.
If the value of the control is Null,the procedure uses the Nz function to convert a Null value to a zero-length string.
You use zero-length strings when you need to add a value to a required field, but you don't yet know what that value is.
In Microsoft Access version 2.0 and earlier,you could use the Format function to return one value for a zero-length string and another for a value.
Remember that you can enter zero-length strings only in fields set to the Text, Memo, and Hyperlink data types, and that those types allow zero-length strings by default.
A formula always returns one of three values: a number value; a text value,which may be a zero-length string, or an error value, such as NUM!
Using Format with zero-length strings In Microsoft Access version 2.0 and earlier, you could use the Format function to return one value for a zero-length string and another for a value.
In the Update To row for each field,enter either NULL or a zero-length string- a pair of double-quotation marks with no space between them("").
This change applies only when you use the Formatfunction to format a string dependent on whether it's a zero-length string or a Null value.
To prevent this, you can test for a zero-length string by using the ISTEXT function and by using the IF function to replace the zero-length with a 0(zero) as the following example shows.
If you later determine that the customer doesn't have a fax machine,you can enter a zero-length string in the field to indicate that you know there is no value.
Note: If a text field contains null and zero-length strings, when sorted in ascending order, the records with null values are listed first, then the records with zero-length strings, and then the records with nonblank values.
Makes it easier to delete values by updating the existing values to either a null value(that is,no data) or a zero-length string(a pair of double quotation marks with no space between them).
Note: If a text field contains null and zero-length strings, when sorted in ascending order, the records with null values are listed first, then the records with zero-length strings, and then the records with nonblank values.
Note: If you use the Nz function in an expression in a query without using the valueifnull argument,the results will be a zero-length string in the fields that contain null values.
Remember that running an update query to deletedata changes your existing values to either NULL or a zero-length string(a pair of double quotation marks with no space in between), depending on the criteria that you specify.
Makes it easier to delete values by updating the existing values to either a null value(that is,no data) or a zero-length string(a pair of double quotation marks with no space between them).
If you want to delete individual fields from a table, convert the select query to an update query,enter NULL or a zero-length string("") as the update criteria, and run the query.