DISTINCT is used to remove duplicate rows from the SELECT query and only display one unique row from result set. Examples Let’s set up a new table in PostgreSQL and use it to look at a few helpful ways that DISTINCT can remove duplicates and reveal useful information from the data. First...
In PostgreSQL, you can use the DISTINCT clause to retrieve unique rows based on one or more columns. By specifying multiple columns with DISTINCT, you filter the results to return only the unique combinations of the specified columns. Additionally, PostgreSQL provides a DISTINCT ON clause that all...
The PostgreSQL statement will give us the unique values for both columns, back_color, and fore_color, from the ColorProperties table. RED COLOR is present in both columns, back_color, and fore_color, in the ColorProperties table as we added back_color and fore_color with the DISTINCT claus...
Each organization’s logging requirements are unique, and therefore how PostgreSQL logging should be configured will be different as well. What a financial service company needs to capture within its database logs will be different from what a company dealing with critical health information needs to...
Key Features of PostgreSQL Other than the standard features of a relational database that includes typical data types, transactional integrity, and querying layer, Postgres possesses some unique features that make it different from other databases in comparison. Let us look into these features as list...
PostgreSQL's ability to seamlessly integrate structured relational data with the flexibility of unstructured JSON data offers developers a unique advantage. By understanding how to query JSON columns effectively, one can harness the full potential of Postgres, making it easier to manage, retrieve, and...
PostgreSQL Data Types The data type can be any of the following: boolean: Use "boolean" or "bool" to declare a true or false value. character values char: holds a single character char (#): holds # number of characters. Spaces will be inserted to fill any extra room. ...
PostgreSQL array_agg Function The array_agg function in PostgreSQL is an aggregate function that collects multiple values from a group and returns them as an array. This is especially useful for aggregating data from multiple rows into a single array format, enabling you to perform complex data ...
In PostgreSQL, the “CREATE” command can be executed with the “VIEW” keyword tocreate a view, as demonstrated in the following syntax: CREATE VIEW name_of_view AS select_query; Here, -“CREATE VIEW” is a command that creates a new virtual table. ...
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