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#1
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No success with setting query criteria for returning empty
I have imported tables from another database into Access and one of these
tables has a field that stores a value that denotes the status for each student enrolled in a school. The values appear as "N" for students "Not Returning" for a new school term, "I" for students withdrawing during the term and are "Inactive" for the remainder of the term, and what appears to be as "blanks" or "empty" for "active" students. Using a query on that table. I'm trying to set the criteria for the Status field so that it will return only "active" students, but having no success with trying conditions such as Not Like "N" And Not Like "I", or "I" And "N", or Like " ", or = " ". Each of these appear to return no data at all. The query runs fine when setting the criteria of the Status field as either Like "N" to return only the students "Not Returning", Like "I" to return only students withdrawing during the term, or Like "I" or Like "N" to return all the student who are not active. It's only when setting the criteria so that only "active" students are returned by the query that does not seem to work. I'm wondering if the Status field of the imported table could have some hidden value for the "active" students, and Access can "see" this value. The Status field appears as being "blank" or empty for "active" students in its original database as well. All help will be greatly appreciated. Thanks in advance, RC |
#2
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No success with setting query criteria for returning empty
It sounds like active Students have Null value for this Status Field. Try:
Is Null in the criteria row for this Field column. -- HTH Van T. Dinh MVP (Access) "RC" wrote in message ... I have imported tables from another database into Access and one of these tables has a field that stores a value that denotes the status for each student enrolled in a school. The values appear as "N" for students "Not Returning" for a new school term, "I" for students withdrawing during the term and are "Inactive" for the remainder of the term, and what appears to be as "blanks" or "empty" for "active" students. Using a query on that table. I'm trying to set the criteria for the Status field so that it will return only "active" students, but having no success with trying conditions such as Not Like "N" And Not Like "I", or "I" And "N", or Like " ", or = " ". Each of these appear to return no data at all. The query runs fine when setting the criteria of the Status field as either Like "N" to return only the students "Not Returning", Like "I" to return only students withdrawing during the term, or Like "I" or Like "N" to return all the student who are not active. It's only when setting the criteria so that only "active" students are returned by the query that does not seem to work. I'm wondering if the Status field of the imported table could have some hidden value for the "active" students, and Access can "see" this value. The Status field appears as being "blank" or empty for "active" students in its original database as well. All help will be greatly appreciated. Thanks in advance, RC |
#3
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No success with setting query criteria for returning empty
If there is nothing at all in the Status field for active students, the
value will be Null In the Criteria row under this field in query design, enter: Is Null Nulls behave differently than other types of data. A null really means 'Unknown', or 'Not applicable'. Strictly, it is not the right thing to store where the student's status is known. It would make more sense to use an Update query to change all the nulls into another code such as "C" for Current students. (If it's somebody else's application, that might break the way they set up the rest of the application though.) If you are interesting in learning about how to handle Nulls, see: Common errors with Null at: http://allenbrowne.com/casu-12.html -- Allen Browne - Microsoft MVP. Perth, Western Australia. Tips for Access users - http://allenbrowne.com/tips.html Reply to group, rather than allenbrowne at mvps dot org. "RC" wrote in message ... I have imported tables from another database into Access and one of these tables has a field that stores a value that denotes the status for each student enrolled in a school. The values appear as "N" for students "Not Returning" for a new school term, "I" for students withdrawing during the term and are "Inactive" for the remainder of the term, and what appears to be as "blanks" or "empty" for "active" students. Using a query on that table. I'm trying to set the criteria for the Status field so that it will return only "active" students, but having no success with trying conditions such as Not Like "N" And Not Like "I", or "I" And "N", or Like " ", or = " ". Each of these appear to return no data at all. The query runs fine when setting the criteria of the Status field as either Like "N" to return only the students "Not Returning", Like "I" to return only students withdrawing during the term, or Like "I" or Like "N" to return all the student who are not active. It's only when setting the criteria so that only "active" students are returned by the query that does not seem to work. I'm wondering if the Status field of the imported table could have some hidden value for the "active" students, and Access can "see" this value. The Status field appears as being "blank" or empty for "active" students in its original database as well. All help will be greatly appreciated. Thanks in advance, RC |
#4
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No success with setting query criteria for returning empty
"Van T. Dinh" wrote: It sounds like active Students have Null value for this Status Field. Try: Is Null in the criteria row for this Field column. -- HTH Van T. Dinh MVP (Access) "RC" wrote in message ... I have imported tables from another database into Access and one of these tables has a field that stores a value that denotes the status for each student enrolled in a school. The values appear as "N" for students "Not Returning" for a new school term, "I" for students withdrawing during the term and are "Inactive" for the remainder of the term, and what appears to be as "blanks" or "empty" for "active" students. Using a query on that table. I'm trying to set the criteria for the Status field so that it will return only "active" students, but having no success with trying conditions such as Not Like "N" And Not Like "I", or "I" And "N", or Like " ", or = " ". Each of these appear to return no data at all. The query runs fine when setting the criteria of the Status field as either Like "N" to return only the students "Not Returning", Like "I" to return only students withdrawing during the term, or Like "I" or Like "N" to return all the student who are not active. It's only when setting the criteria so that only "active" students are returned by the query that does not seem to work. I'm wondering if the Status field of the imported table could have some hidden value for the "active" students, and Access can "see" this value. The Status field appears as being "blank" or empty for "active" students in its original database as well. All help will be greatly appreciated. Thanks in advance, RC Thanks, that worked fine |
#5
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No success with setting query criteria for returning empty
"Allen Browne" wrote: If there is nothing at all in the Status field for active students, the value will be Null In the Criteria row under this field in query design, enter: Is Null Nulls behave differently than other types of data. A null really means 'Unknown', or 'Not applicable'. Strictly, it is not the right thing to store where the student's status is known. It would make more sense to use an Update query to change all the nulls into another code such as "C" for Current students. (If it's somebody else's application, that might break the way they set up the rest of the application though.) If you are interesting in learning about how to handle Nulls, see: Common errors with Null at: http://allenbrowne.com/casu-12.html -- Allen Browne - Microsoft MVP. Perth, Western Australia. Tips for Access users - http://allenbrowne.com/tips.html Reply to group, rather than allenbrowne at mvps dot org. "RC" wrote in message ... I have imported tables from another database into Access and one of these tables has a field that stores a value that denotes the status for each student enrolled in a school. The values appear as "N" for students "Not Returning" for a new school term, "I" for students withdrawing during the term and are "Inactive" for the remainder of the term, and what appears to be as "blanks" or "empty" for "active" students. Using a query on that table. I'm trying to set the criteria for the Status field so that it will return only "active" students, but having no success with trying conditions such as Not Like "N" And Not Like "I", or "I" And "N", or Like " ", or = " ". Each of these appear to return no data at all. The query runs fine when setting the criteria of the Status field as either Like "N" to return only the students "Not Returning", Like "I" to return only students withdrawing during the term, or Like "I" or Like "N" to return all the student who are not active. It's only when setting the criteria so that only "active" students are returned by the query that does not seem to work. I'm wondering if the Status field of the imported table could have some hidden value for the "active" students, and Access can "see" this value. The Status field appears as being "blank" or empty for "active" students in its original database as well. All help will be greatly appreciated. Thanks in advance, RC Thanks, that worked fine. |
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