How is SQL query so fast?

Question

The reason SQL is so fast is that for a database product to be successful it must return sets of data quickly when queried. In most database organizations many of the companies brightest people work constantly on the query engine so it creates 'optimal' query plans that work quickly.

How is SQL so efficient?

SQL excels at extracting data from tables. It is also very effective at joining data from multiple tables. SQL, however, experiences issues with transforming data into other formats. If there is no need to transform data in the query or manipulation, the chance for SQL to experience speed issues is decreased.

How are database so fast?

Most people ask why is database so faster when compared to flat file entries of data. There are many reasons behind that, one of them is indexing. Of course the speed of the underlying disk subsystem's also plays a major role in increasing database speed.

How quick is SQL?

Here, SQL performs well at around 750 microseconds. R needs more or less time depending on whether one uses the aggregate() function (1600 microseconds) or the by() function (450 microseconds).

How long does a SQL query take?

The query takes 20 to 500 ms (or sometimes more) depending on the system and the amount of data. The performance of the database or the database server has a significant influence on the speed.

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