¿Por qué los atributos tienen valores nulos o vacíos después de una unión?

Why do attributes have null or empty values after a join?

After performing a join between a feature class and a stand-alone table, such as dBASE IV, dBASE V, CSV, or PRN, the values in the fields from the joined table are empty or null. Null values can be the result of several factors:

For example, a tree could have strong Arc pointers from parent nodes to children, and Weak pointers from children back to their parents. Creating a new reference from an existing reference-counted pointer is done using the Clone trait implemented for Arc and Weak .

For example, ‘NEW YORK’ does not join with ‘New York’. To convert string values to the proper case, refer to How To: Convert a string to proper case in the ArcMap Field Calculator for more information. The name of the table or feature class, or field names in the table or feature class include spaces or special characters.

The name of the table or feature class, or field names in the table or feature class include spaces or special characters. Refer to FAQ: What characters should not be used in ArcGIS for field names and table names? for more information.

When data type is converted to decimal, the null values becomes null in Power Query Editor window. When “Close and Apply”, the table in DAX or main PowerBI windows, shows the null values as blank. The same column also contains values which are 0s (zero). So,the column now contaions number values, 0 and blank values.

In the Query Editor, Null is treated as blank. 09-30-2020 04:35 AM Did I answer your question? Mark my post as a solution! Appreciate your Kudos!! Proud to be a Super User! 09-30-2020 05:21 PM It did not work. Throws below error when tried to display the measure in a key card. 09-30-2020 05:32 PM e.g. =IF ( [colA]=null, 0, [colA]).

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When to Use null (And When Not to Use It) The basic rule is simple: null should only be allowed when it makes sense for an object reference to have ‘no value associated with it’. (Note: an object reference can be a variable, constant, property (class field), input/output argument, and so on.)

The reason for this is simple: null doesn’t exist for value types. Why? As we have seen previously, a reference is a pointer to a memory-address that stores a value (e.g. a string, a date, a customer, whatever). If a reference points to null, then no value is associated with it.