Shulou(Shulou.com)06/01 Report--

This article mainly explains the "simplification skills of internal connections in SQLite". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the simplification skills of internal connections in SQLite".

Internal connection Simplification skills in SQLite

In SQLite, two tables can be associated through conditional expressions through inner joins to form a new recordset or view. The form is as follows:

SELECT... FROM t1 JOIN t2 ON t1.c1=t2.c2

If the column C1 of table T1 and the column C2 of table T2 have the same name, you can use USING expressions to simplify. The form is as follows:

SELECT... FORM T1 JOIN T2 USING (C1)

Where column C1 exists in both tables T1 and T2.

If C1 is the only identical column in both tables, or if you use all columns with the same name in both tables as a condition, you can use NATURAL JOIN to simplify. The form is as follows:

SELECT... FROM t1 NATURAL JOIN t2

In this way, SQLite automatically builds the inner join with columns with the same names as T1 and T2.

Thank you for your reading, the above is the content of "the simplification skills of connections in SQLite". After the study of this article, I believe you have a deeper understanding of the simplification skills of connections in SQLite, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.