SQLDQL条件查询SELECT 字段列表 FROM 表名 WHERE 条件列表比较运算符功能>大于>=大于等于<小于<=小于等于=等于<> 或！=不等于BETWEEN...AND...在某个范围内（含最小，最大值）IN（...）在in之后的列表中的值，多选一LIKE 占位符模糊匹配（_匹配单个字符，%匹配任....

文章 2024-01-31 来自：开发者社区

【MySQL】学习如何通过DQL进行数据库数据的基本查询

SQLDQLDQL（Data Query Language）数据查询语言，用来查询数据库中表的记录。关键字：SELECTDQL查询类型分类SELECT 字段列表 FROM 表名列表 WHERE 条件列表 GROUP BY 分组字段列表 HAVING 分组后条件列表 ORDER BY 排序字段列表 LIMIT 分页参数DQL-基本查询1....

文章 2023-02-22 来自：开发者社区

Spring学习（十）：JdbcTemplate操作数据库实现查询功能

今天记录查询返回三种类型：1、查询后返回一个值2、查询后返回一个对象3、查询后返回一个集合1、查询后返回一个值例如：查询表中有多少条记录，返回一个int代码间的具体逻辑见上篇博客实体类Book:package demo.entity; public class Book { private String userId; private ...

问答 2021-09-30 来自：开发者社区

学习sql数据库查询语句看什么书？

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更新时间 2024-06-22 13:43:03

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