Fix “Sample method … cannot be used with a discrete sample count” When Using the SAMPLE Clause in DuckDB

If you’re getting an error that reads something like “Sample method System cannot be used with a discrete sample count” when using the SAMPLE clause in DuckDB, it looks like you’re specifying an invalid sampling method for the context with which you’re using the SAMPLE clause. Perhaps you’re using system or bernoulli, when you should be using reservoir.

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Adding Quotes Around Field Values When Outputting DuckDB Query Results as a List

In this article we look at how to automatically enclose values in single quotes when outputting DuckDB query results as a list. Using this method, each value is formatted as SQL literals. This can be useful when you want to escape the values for SQL or for some other purpose.

We also look at how CSV output is sometimes quoted with double quotes, and how we can adjust the results by doing things like removing the headers and changing the list separator.

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Sampling Rows from a Table in DuckDB with the SAMPLE Clause

DuckDB’s SAMPLE clause is a handy feature that allows us to work with a random subset of our data. This is particularly useful when dealing with large datasets where processing the entire dataset might be time-consuming or unnecessary for exploratory data analysis, testing queries, or creating representative samples.

When we use this clause, we can specify the absolute number of rows to return, or a percentage of rows. We also have an option of sampling method to use.

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Enable Vertical Query Output in DuckDB

When 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.

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