Here are seven options for finding duplicate rows in SQL Server, when those rows have a primary key or other unique identifier column.
In other words, the table contains two or more rows that share exactly the same values across all columns except for its unique identifier column.
Continue readingIf you ever encounter a character column that should be a numeric column, there’s always a possibility that it contains non-numeric data that you don’t know about.
In MariaDB, you can run a query like the following to return non-numeric data from the column.
Continue readingWhen using T-SQL with SQL Server, we can format numbers using various methods, depending on our desired format.
Below are four functions that can be used to format a number to two decimal places in SQL Server.
Continue readingHere are three options for returning rows that contain lowercase characters in SQLite.
Continue readingHere are four methods you can use to find duplicate rows in SQL Server.
By “duplicate rows” I mean two or more rows that share exactly the same values across all columns.
Continue readingHere are three examples of returning a list of stored procedures that reference a specific table in PostgreSQL.
Continue readingHere are three options for listing out the triggers for a given table in PostgreSQL.
Continue readingHere’s an example of returning rows that contain only non-alphanumeric characters in SQLite.
Non-alphanumeric characters include punctuation characters like !@#&()–[{}]:;',?/* and symbols like `~$^+=<>“, as well as whitespace characters like the space or tab characters.
The following queries can be used to return duplicate rows in SQLite.
Here, the duplicate rows contain duplicate values across all columns, including the ID column.
Continue readingHere are five options for using SQL to return only those rows that have the maximum value within their group.
These examples work in most major RDBMSs, including MySQL, MariaDB, Oracle, PostgreSQL, SQLite, and SQL Server.
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