If you’re getting an error that reads something like “No function matches the given name and argument types ‘bool_and(INTEGER)’” in DuckDB, it’s probably because you’re passing a non-boolean value to the bool_and() function.
The bool_and() function is for use against boolean expressions, so to fix this issue, be sure that the argument you pass to the function is a boolean expression.
DuckDB is a high-performance, in-process SQL database management system that supports various modes of operation, including the ability to create an in-memory database. An in-memory database stores all data in RAM, ensuring fast access and excellent performance.
This article explores how to create an in-memory database in DuckDB.
Continue readingWhen using DuckDB’s command line interface (CLI), we can use the .mode command to change how query results are formatted. For example, we can output query results as a table, in CSV format, or even JSON. Another option is to output it in “line” mode, which outputs the query results vertically, as opposed to horizontally across the screen.
This article demonstrates how to enable vertical query output in the DuckDB CLI with line mode.
Partial indexing is a feature in many DBMSs, including SQLite, that allows developers to optimize database performance by creating indexes only for specific subsets of data. This can significantly reduce the index size and improve query speed, especially in cases where only a portion of the data is frequently queried.
In this article, we’ll look at how to create a partial index in SQLite, why it’s useful, and provide an example to illustrate its use.
Continue readingIf you’re getting an error that reads “mode should be one of: ascii box column …etc” in DuckDB, it appears that you’re trying to set the output mode to an invalid value.
While we can change the output mode in DuckDB, it must be one of the supported modes.
To fix this issue, be sure to use a supported mode.
Continue readingDuckDB’s CLI provides a convenient way to generate INSERT statements from query results. This can be particularly useful for data migration, creating test data, or backing up specific data subsets. Here’s how to do it.
NULL values in databases can be tricky to handle and often lead to unexpected results. DuckDB’s COALESCE() function provides an easy way to manage NULL values effectively.
In this article, we’ll explore the COALESCE() function in DuckDB with some practical examples.
DuckDB is a lightweight, fast database management system designed for analytics and embedded use cases. Its versatility makes it an excellent choice for developers and data analysts.
One useful feature of DuckDB is the ability to output query results in different formats, such as JSON, directly from the command-line interface (CLI). By default, the DuckDB CLI uses the duckbox output mode for query results (which outputs the results in a table-like format), but we can change that.
In this article, we’ll walk through the steps to output query results as JSON when using the DuckDB CLI.
Continue readingDuckDB is a fast, efficient, and embeddable SQL database designed for analytical workloads. As with any other RDBMS, a common task is listing all the tables in your DuckDB instance.
This article covers five options for displaying a list of tables in DuckDB.
Continue readingDuckDB’s command line interface (CLI) provides a convenient .mode csv command that allows you to output all query results directly in CSV format. This approach differs from the COPY statement as it affects the output format of all subsequent queries until changed.
The article takes a quick look at CSV mode in the DuckDB CLI.
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