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The IS Operator In QGIS

In this post, we will explore the various applications of the IS operator in QGIS, addressing frequently asked questions such as how to use it for checking NULL values, its inability to compare data directly, and its specific use cases in data cleaning and analysis.

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Select NULL values in QGIS

In QGIS, as in many other database and GIS systems, a NULL value represents the absence of a value. It indicates that the data is missing or unknown for a particular field in a dataset. Here’s how you can do it step-by-step:

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Using the IN operator in QGIS

In QGIS, the IN operator is used in expressions, particularly when you need to test if a value exists within a set of values. This is particularly useful in filtering data, styling layers, or defining conditional expressions in the Field Calculator.

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Using The BETWEEN Operator In QGIS

Here’s a step-by-step guide on how you might use the BETWEEN operator in QGIS:

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Using the AND operator in QGIS

In QGIS, the “AND” operator is used within expressions to ensure that multiple conditions must be true for the expression to return true. Here’s how you can use the “AND” operator in different contexts in QGIS

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Using ILIKE Operator In QGIS

The ILIKE operator in QGIS is used for case-insensitive pattern matching. It functions similarly to the LIKE operator but does not consider case, making it particularly useful when dealing with data where case consistency might not be guaranteed. Here’s how you can use the ILIKE operator in QGIS:

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Using The “LIKE” Operator In QGIS

In QGIS, the LIKE operator is used in expressions to match a pattern in a string. This operator is often used in queries or expressions for filtering data. Here’s how to use the LIKE operator in QGIS:

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Change The Projection Of My QGIS Project?

Changing the projection or the Coordinate Reference System (CRS) of your QGIS project. Here’s how you can change the CRS in QGIS:

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Change The Default Colour Of The Canvas In QGis

How do I change the default colour of the canvas in QGIS

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Calculate line length In QIGS

Measuring and calculating line lengths accurately in QGIS with our comprehensive guide. From understanding the difference between $length and length($geometry) to converting units and ensuring your data reflects real-world distances accurately.

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