学习目标什么是数据库，什么是MySQLSQL语句了解DDL、DML、DQL查询语句（重点）什么是聚合函数什么是分页查询什么是分组查询第一章介绍数据库1. 数据库概述DBMS：数据库管理系统（Database Management System）是一种操纵和管理数据库的大型软件，例如建立、使用和维护数据库。DB：数据库（Database）SQL：结构化查询语言，（Structure Query ....

文章 2022-12-05 来自：开发者社区

mysql查询所有数据库、表、字段常用sql语句

查询所有数据库名称：SELECT `SCHEMA_NAME` FROM `information_schema`.`SCHEMATA` 查询特定数据库下的所有表//查询数据库名称为lml下的所有表 select table_name from information_schema.tables where table_schema='lml' ；查询特定表下的所有字段select COLUM.....

文章 2022-10-14 来自：开发者社区

Mysql数据库 | SQL语句解析『上篇』

mysql来源mysql是mysqlAB公司的mysqlAB公司被sun公司收购了sun公司又被Oracle公式收购了mysql现在是由oracle公司负责维护Oracle是收费的，mysql是免费的navicat快捷键在行尾：Shift+Home键选中当前行。在行尾：Ctrl+Shift+Home键从光标处一直选中文本开头在行首：Shift+End键选中当前行。在行首：Shift+En....

问答 2022-04-15 来自：开发者社区

在php+mysql数据库设计中，查找匹对带有“不限”的sql语句

在mysql中有属相和血型字段，怎么写一条sql语句能这样查到结果，当属相和血型都有具体值时，可以进行查询。加上“不限”,应该怎么写查询语句呢？

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更新时间 2024-06-06 10:45:35

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