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This article is to share with you about the advanced grammar of Oracle-SQL. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Structured query language (Structured Query Language) referred to as SQL, is a special purpose programming language, is a database query and programming language, used to access data and query, update and manage relational database systems.

Structured query language is a high-level non-procedural programming language that allows users to work on high-level data structures. It does not require the user to specify the data storage method, nor does it require the user to know the specific data storage method, so different database systems with completely different underlying structures can use the same structured query language as the interface for data input and management. Structured query language statements can be nested, which makes it have great flexibility and powerful functions.

It was written because of work six years ago, and now all the work-related items have been deleted, leaving only the pure technical part, and it has also been unsealed; from today's point of view, there are still many knowledge points that have not been involved, because they have not been contacted for a long time, and they are too lazy to write down. SQL can be regarded as a separate language, and it is easy to get started. Perhaps every programmer can speak proficient in SQL, but very few of them really understand the nature of SQL. SQL and database system, SQL and performance optimization, SQL and index, SQL and execution plan, SQL and XML, SQL and CTE, SQL and recursion and so on. A small SQL can write hundreds of lines and run for a few days, while different people may be able to write a few lines or dozens of lines, or they may be tens of thousands of times faster; the real DBA is often a master of SQL, lifting weights lightly, and the original itpub is the place of hiding dragons and tigers; with the changes of the big data era, SQL is also advancing with the times and constantly developing.

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