If you’re getting error “ERROR 1054 (42S22): Unknown column ‘colname’ in ‘order clause’” in MariaDB, it may be that you’re trying to reference an aliased column by its column name.
This is a common error when running queries that join two or more tables. It can also happen when using operators such as UNION, INTERSECT, and EXCEPT.
In MySQL, the TABLE statement returns rows and columns of the given table.
The TABLE statement is similar to the SELECT statement, and it can be used as a kind of shorthand version of the SELECT statement.
The TABLE statement was introduced in MySQL 8.0.19.
In MySQL, the VALUES statement returns a set of one or more rows as a table. Basically, it’s a table value constructor in accordance with the SQL standard, which also functions as a standalone SQL statement.
The VALUES statement was introduced in MySQL 8.0.19.
In MySQL, SHOW TABLES is an administrative statement that lists the non-TEMPORARY tables and views in a given database.
SHOW TABLES only lists the tables and views for which you have privileges.
Below are two methods for returning rows that only contain alphanumeric characters in MariaDB.
Alphanumeric characters are alphabetic characters and numeric characters.
Continue readingIf you’re getting the error “ORA-01790: expression must have same datatype as corresponding expression” in Oracle Database, it’s probably because you’re using an operator such as UNION, INTERSECT, or EXCEPT to run a compound query, but the columns returned by each query use different data type groups.
To fix this issue, you’ll need to ensure that each column returned by the second query uses the same data type group as the corresponding column in the first query.
Continue readingHere are five options for using SQL to return only those rows that have the minimum value within their group.
These examples work in most major RDBMSs, including MySQL, MariaDB, Oracle, PostgreSQL, SQLite, and SQL Server.
Continue readingThere are at least a few possible reasons you might be getting the dreaded error 1064 (42000) that reads “You have an error in your SQL syntax…” etc when trying to use the MINUS operator in MariaDB.
I’ll explore these below and offer some solutions.
Continue readingIn MySQL, the UNION clause combines the results from multiple queries into a single result set.
Here are three examples of using SQL to find and select the row with the minimum value in a given column.
The examples work in most major RDBMSs, including MySQL, MariaDB, PostgreSQL, SQLite, Oracle, and SQL Server.
Continue reading