BATJTMD and other large factories interview more and more difficult, but whether from large factories or small companies, has been the focus of the SQL optimization experience. When it comes to databases, the interviewer will ask, “Why don’t you start with your insight into SQL optimization?” .

If your team is good at SQL optimization, it will be a major step forward in the usability of your entire large system, and it will really save your boss more than a few bucks. It is also the technology stack that programmers must master when they jump ship and get a raise.

Did your interviewer beat you with SQL? Don’t panic! This set of notes can help you systematically learn SQL knowledge, from basic to advanced, say goodbye to the disadvantages of fragmented acquisition of knowledge, help you build up the knowledge context. Here I share this set of notes in open source form:

SQL based

Select + distince + top usage

Where +and and or operators +order by usage

Insert into the usage, update and delete

Like +in +between

Join +union+select into and insert into

Create + ALTER table+view

Null + AS + constraint syntax

Constraint instance + index + subquery usage

Having + transactions + common math functions

Common date function + common character processing function + common data type

SQL senior

Temporary table +case when+ derived table

Dblink+ set + grouping set

Merge into+ Stored procedure

Windowing function over+ variable + recursion

Flow control + dynamic SQL+ trigger

SQL optimization has become a measure of the program ape is good or not hard indicators, and even in the major factory recruitment functions are clearly marked, if you, in this problem can be suspended or the interviewer will be suspended?

Want to enter big factory, want to go up the hill you, maybe my set of ‘SQL into god’s road ‘may be helpful to you.

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