TOP 4 dbt tips for data analyst and data engineer dbt (data bu | Big Data Science

TOP 4 dbt tips for data analyst and data engineer
dbt (data build tool) is an open source code framework for executing, testing and documenting SQL queries, which allows you to process data analysis machine, including structuring and description of arrivals, their search, nested calls, rule triggering, documentation and testing. For example, you can use the dbt CLI or dbt Cloud to work with data collection to consume, transform, and load data into storage by computing a dynamic database on a schedule. To increase the efficiency of using dbt for the selection of schemas, sources and models, it is possible to use data:
• The Schema.yml file can only be found in the dbt models folder. The tool allows you to create a unit test that counts the duration of a column for nulls.
• dbt data tests have a strict rule that they must return null rows in order to pass the test. Instead of looking for a value such as the number of a particular set of rows, the data test should be written to expect to find null rows if the results do not match the correct set of sums. Therefore, when developing test data, you need to think about how to return 0 rows in the expected key, but at the same time you need to check the number. You can use the != or <= operators to validate data.
• To increase the speed of testing increase the number of threads in the project profile, in the profiles.yml file. For example, if there are 30 tests, then there are 40 threads, indicate in the profiles.yml file. Probably 30 data and schema tests in 4 seconds.
• The history test needs a meaningful name. Although dbt automatically learns the test names, it is recommended that you label them yourself. dbt doesn't have much control over running small test suites, it needs to be able to see all running projects. In the same way that developers are encouraged to use functions and variables with semantic name definitions, testing should be given tests for meaningful names. Otherwise, it will be difficult to determine which test passes or fails during test execution. When a test error is found in dbt, all schema and data tests are run together. It's not easy to use a single directory in the data tests folder, but you can name them "dbt test - schema" or "dbt test - data" to quickly determine which tests to use.

https://corissa-haury.medium.com/4-quick-facts-about-dbt-testing-5c32b487b8cd