In MariaDB, collation can be applied at many levels. Collation can be applied at the server level, the connection level, the database level, the table level, and even at the column level.
It’s also possible to specify a collation at the query level, so that it will override any collation that has been applied at the database, table, or column levels.
MariaDB provides a number of options for returning the collation at the various levels.
Continue readingIn MariaDB, CHAR() is a built-in string function that returns characters based on their code values.
CHAR() accepts one or more integers. It then returns a string consisting of the characters given by the code values of those integers.
In MariaDB, CHR() is a built-in string function that returns a character based on the code values provided as an argument.
In MariaDB, ORD() is a built-in string function that returns the numeric character code of the leftmost character of its string argument.
The ORD() function can handle multi-byte characters. This is in contrast to the ASCII() function, which only handles single-byte (8 bit) characters.
In MariaDB, ASCII() is a built-in string function that returns the numeric ASCII value of the leftmost character of its string argument.
The ASCII() function only works on 8 bit characters. To get the code for multi-byte characters, use the ORD() function instead.
Here’s how to install MariaDB on a Mac via the Homebrew package manager.
Continue readingIn MongoDB, the cursor.sort() method specifies the order in which the query returns matching documents.
The sort() method accepts a document that specifies the field to sort, and the sort order. The sort order can be either 1 for ascending or -1 for descending.
You can also specify { $meta: "textScore" } when doing $text searches, in order to sort by the computed textScore metadata in descending order.
In MongoDB, the $orderBy query modifier sorts the results of a query in ascending or descending order.
$orderBy accepts a document that specifies the field to sort, and the sort order. The sort order can be either 1 for ascending or -1 for descending.
$orderBy has been deprecated in the mongo shell since v3.2. Use the cursor.sort() method instead.
In MongoDB, the $sort aggregation pipeline stage sorts all input documents and returns them to the pipeline in sorted order.
In MongoDB, the $switch aggregation pipeline operator evaluates a series of case expressions, and executes a specified expression only when a case expression evaluates to true.