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System Center Configuration Manager 2007 : Creating Queries (part 3) - Criterion Type, Operators, and Values

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11/21/2011 9:15:29 AM

Criterion Type, Operators, and Values

The previous section, “ConfigMgr Query Builder,” briefly described criterion, operators, and values (each displayed in Figure 7). However, each of these elements of a query deserves additional detail:

  • Criterion— Specify the type of criterion to use for comparison. The options follow:

    • Null value— Compares a query attribute to a null value. An example of where you may find a null value would be for a system that is discovered but has not yet reported inventory. The System class would have valid data, but the Computer System class would have no information, which would be a null value. Another example would be when looking for systems that are not ConfigMgr clients. You see that SystemResource contains the Client attribute. Simply setting SystemResource.Client is not equal to 1 will not provide the expected results, because that attribute only exists if the site knows that the system is not a client. The proper query would include SystemResource.Client is NULL Or SystemResource.Client is 0.

    • Prompted value— This is a placeholder for a simple value that prompts the user at runtime. Using a prompted value provides additional flexibility to a query. As an example, if you are querying information for a specific computer, instead of statically entering the computer name into the query, you can elect to use a prompted value. This capability allows you to easily run the query for multiple systems without the need to create additional queries. Another example is creating a query such as “C: drive has less than x MB free.” Here, using a prompted value allows you to define the value of x when running the query. The prompted value type exists in queries, but not in collections.

    • Simple value— Compares to a constant value. Selecting Simple value enables the simple value settings. This is the most basic of operators. Use Simple value when you are looking for a single criterion.

    • Attribute reference— Compares to another attribute. Selecting Attribute reference enables the attribute reference settings. In this case, you compare two different attributes. One example is to find out all the PCs in which the processor’s current clock speed is less than the maximum clock speed.

    • SubSelected values— Compares to results returned by another query. Selecting SubSelected values enables the subselected values settings. You can use this when you want to compare an attribute with the results of another query. One good example is to find out all the computers that do not have specific software.

    • List of values— Compares to a list of constant values. Selecting List of values enables the list of values settings. A classic example is listing all systems where the chassis is classified as a notebook. For additional information on chassis types, review information on the Win32_SystemEnclosure at http://msdn.microsoft.com/en-us/library/aa394474.aspx.

      Figure 7 shows the Criterion Properties dialog box, where List of values is specified as the Criterion Type setting. Cross-referencing the values shown in Figure 7 with the Chassis Types property of the Win32_SystemEnclosure class will show you that this query is for Portable, Laptop, Notebook, and Sub Notebook chassis types.

    Figure 7. Using List of values as the Criterion Type setting

  • Operator— This dropdown field specifies how to assess the values. Options vary, depending on the value defined for the criterion type. When the criterion type is Simple, these values include the following:

    Is equal to

    Is greater than

    Is greater than or equal to

    Is less than

    Is less than or equal to

    Is like

    Is not equal to

    Is not like

    Lowercase is equal to

    Lowercase is greater than

    Lowercase is greater than or equal to

    Lowercase is less than

    Lowercase is less than or equal to

    Lowercase is like

    Lowercase is not equal to

    Lowercase it not like

    Uppercase is equal to

    Uppercase is greater than or equal to

    Uppercase is less than

    Uppercase is less than or equal to

    Uppercase is like

    Uppercase is not equal to

    Uppercase is not like

  • Values— Specify a value by entering it into the Value text box. You can also click the Values... button, which will query ConfigMgr for a list of possible values and allow you to select a value. If the number of possible values is very large, the list is truncated. You can use wildcards with strings by selecting one of the operators that uses the Like clause:

    • _ (underscore)— Matches any one character

    • % (percent)— Matches any zero or more characters

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