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Título: Integrated date and time functions


Descripción automática: In this video, the presenter discusses the integrated date and time functions in various SQL database systems, emphasizing the importance of understanding the different data types, formats, and how they are handled by these systems. The video outlines the distinct date and time types across databases like IBM DB2, MySQL, SQL Server, and Oracle, highlighting variances in precision such as microseconds and nanoseconds, and in formats like YEAR-MONTH-DAY or with time zones.

The presenter explains how to work with these formats, including the need to consider local time versus time coordinated with UTC/GMT, and how formats can differ based on regions and languages. Emphasizing the necessity of precision when working with time zones and formats, the video also suggests experimenting with inputting dates to understand their storage and retrieval in databases.

Furthermore, the video introduces SQL date functions that extract date parts like the year, month, or day, using an example of an orders table from a food distributor database to illustrate how to select and format dates using these functions. Demonstrating the use of the DATE_FORMAT function, CAST command, and DATEDIFF function, the presenter shows how to manipulate and calculate dates within SQL databases. The video also touches upon how special simulators, like the ones provided by online platforms, can offer practice with these functions but may have different datasets that affect query results.

The summary of the content underscores the significance of comprehending the uniqueness of date fields, the nuances among databases, the utilization of inbuilt date and time functions, and the necessity for correct formatting when making SQL queries. The video details how to format date fields and utilize current date and time functions to calculate time periods, with a final call to always verify these details before querying databases.

Autor/a: Despujol Zabala Ignacio

Curso: Este vídeo es el 18/25 del curso MOOC Introduction to SQL and relational databases.    • MOOC Introduction to SQL and relational da...  
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#SQL #Date and time