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Chapter 7 data filtering Combine WHERE clause AND operator SELECT prod_price,prod_name FROM products WHERE vend_id = 1003 AND prod_price <=10; OR operator SELECT prod_price,prod_name FROM products WHERE vend_id = 1003 OR prod_price <=10; Calculator counts SELECT prod_price,prod_name, ...

Introduction to Alpine Linux 1.Alpine Linux is a lightweight Linux distribution. It is different from the usual Linux distribution (centos, Ubuntu), Alpine uses musl libc and BusyBox reduces system size and runtime resource consumption. 2.Alpine Linux provides its own package management tool ...

Preface In daily projects, we often use if to judge, but in multi-level projects, you will find that the code is cumbersome demand Now there are four products, namely mobile phones, computers, televisions and game consoles. Of course, the prices of each product are different if judgement To see such a r ...

Catalog Add record Update record Delete record Query record WHERE condition GROUP BY multi-table query Create foreign keys Joint query Common mathematical functions of MySQL Common string functions of MySQL Date functions commonly used in MySQL Other common functions Add record # grammar INSERT [I ...

Article directory 4, DDL data definition 4.1 create database 4.2 query database 4.3 modify database 4.4 delete database 4.5 create table 4.6 zoning table 4.7 modification table 5, DML data operation 5.1 data import 5.2 data export 5.3 clear data in the table (Truncate) Six, query 6.1 basic query ...