According to the condition, a relational database management system returns a list of records. However, user's preferences in what should be retrieved, are often vague or imprecise. These preferences can be exp
Vague criteria in relational database queries - Tudorie () Citation Context ...ts on the selection criterion, hence theslogical complexity.sA review of several categories of linguisticallysterms with vague meaning, their fuzzy model andsspecific operations are presented in [4], =-=[5]-=-, ...
The Query Profiler displays only the most useful profiling data captured by the MongoDB Database Profiler, so that you can see potential performance problems at a glance. If you need to investigate further, you can view all the profiling data that is stored insystem.profilefor a query, by c...
Publishing currently reports a number of trimming and NativeAOT warnings, meaning that your application isn't fully guaranteed to run properly. This is expected given the current experimental state of NativeAOT support; the final, non-experimental feature will report no warnings. ...
The count values have increased, meaning our data ingestion is being considered by our queries. Success! Conclusion The opportunities for such an application are endless. Using event timestamps, we can calculate basically any time-based metric we want, while also keeping in-sync with our slowly...
SQL is a strongly typed language, meaning that data types matter. Using functions on incompatible data types can lead to errors or unexpected results. Always be aware of the data types you're working with, and use functions that are appropriate for those types. The CAST function can be your...
A query in PostgreSQL is declarative, meaning the SQL statement tells the database what data to return, but not how. PostgreSQL uses a client-server protocol when sending query text from client to server, and returns the full result no matter how many rows it contains. PostgreSQL ...
The following table shows each of the prompts you may see and summarizes what they mean about the state thatmysqlis in. PromptMeaning mysql>Ready for new query ->Waiting for next line of multiple-line query '>Waiting for next line, waiting for completion of a string that began with a si...
Doing so does not in itself select any database to work with, but that is okay. At this point, it is more important to find out a little about how to issue queries than to jump right in creating tables, loading data into them, and retrieving data from them. This section describes ...
So, what do query complexity and query plans have in common? Memgraph query plans Before they are run, if the database system has declarative query language, such as SQL or Cypher, the query is translated into the query plan first. The query plan defines steps to execute, which yield the...