SQL (Structured Query Language) is a standard programming language for managing relational databases, with powerful data manipulation capabilities, and is widely used for data insertion, query, update, and deletion.
SQL"between and"is a comparison operator that determines whether a value is between two given values, including boundary values. Its basic syntax is as follows:
select column_name(s) from table_name where column_name between value1 and value2;
Column Name is the column name you want to select, Table Name is the table name you want to query, and Value1 and Value2 are the scopes. Note,"between and"The query includes value1 and value2, that is, the query result contains the boundary value.
Here's what about:"between and"Summary of usage:
Syntax: column name between value1 and value2.
Parameter description: A and B represent range values, which can be numbers, texts, and dates.
Features: This operator is used to determine whether a value is between two given values (including boundary values), which belongs to the closed-loop interval.
Application scenario: It is used to filter data that meets a certain range of criteria, such as querying orders within a certain time period, finding people of a certain age group, and so on.
Note: The between and operators are equivalent to the >= and <= operators, so they are equivalent in query efficiency.
Symbols such as < and > can be defined on a case-by-case basis. If you want to include everything, add an equals sign =, if you want to include only one head, then add an equals sign = to the end you want to include, if you don't want to include all of them, you don't need to add an equals sign.
Text strings must be enclosed in single or double quotation marks.
Example: Select * from orders where amount between 100 and 200 is available in the Orders table.
Select * from people where age between 20 and 30.
In short,"between and"It is a very useful SQL operator, which can help us quickly filter out data that meets a certain range of conditions. When using it, it is necessary to pay attention to its characteristics, application scenarios and precautions in order to better play its role.