MySQL表的基本查询操作大全(这一篇够了)

这篇文章将为大家详细讲解有关MySQL表的基本查询操作大全(这一篇够了)，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

MySQL表的基本查询操作大全

查询表中的所有记录

SELECT * FROM table_name;

查询表中的特定列

SELECT column1, column2, ... FROM table_name;

查询表中的唯一记录

SELECT DISTINCT column_name FROM table_name;

按指定顺序查询记录

• 升序：

  SELECT * FROM table_name ORDER BY column_name ASC;

• 降序：

  SELECT * FROM table_name ORDER BY column_name DESC;

限制查询结果

• LIMIT子句：

  SELECT * FROM table_name LIMIT number;

• OFFSET子句（与LIMIT子句配合使用）：

  SELECT * FROM table_name LIMIT number OFFSET offset;

在查询中使用WHERE子句

• 基本比较：

  SELECT * FROM table_name WHERE column_name = value;

• 多条件比较：

  SELECT * FROM table_name WHERE column_name1 = value1 AND column_name2 = value2;

• 范围查询：

  SELECT * FROM table_name WHERE column_name BETWEEN start_value AND end_value;

• 模式匹配：

  SELECT * FROM table_name WHERE column_name LIKE "pattern%";

使用聚合函数

• COUNT：

  SELECT COUNT(*) FROM table_name;

• SUM：

  SELECT SUM(column_name) FROM table_name;

• AVG：

  SELECT AVG(column_name) FROM table_name;

• MIN：

  SELECT MIN(column_name) FROM table_name;

• MAX：

  SELECT MAX(column_name) FROM table_name;

使用GROUP BY子句

SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name;

使用HAVING子句

SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;

使用子查询

• 嵌套子查询：

  SELECT * FROM table_name WHERE column_name IN (SELECT column_name FROM another_table_name);

• 关联子查询：

  SELECT t1.column_name FROM table1 AS t1, table2 AS t2 WHERE t1.column_name = t2.column_name;

使用JOIN

• INNER JOIN：

  SELECT * FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name;

• LEFT JOIN：

  SELECT * FROM table1 LEFT JOIN table2 ON table1.column_name = table2.column_name;

• RIGHT JOIN：

  SELECT * FROM table1 RIGHT JOIN table2 ON table1.column_name = table2.column_name;

• FULL JOIN：

  SELECT * FROM table1 FULL JOIN table2 ON table1.column_name = table2.column_name;

其他有用的查询技巧

• 使用UNION操作符合并查询结果：

  SELECT * FROM table1 UNION SELECT * FROM table2;

• 使用NOT IN运算符查找不在指定值集合中的记录：

  SELECT * FROM table_name WHERE column_name NOT IN (value1, value2, ...);

• 使用EXISTS运算符检查子查询中是否存在记录：

  SELECT * FROM table_name WHERE EXISTS (SELECT * FROM another_table_name WHERE column_name = "value");

以上就是MySQL表的基本查询操作大全(这一篇够了)的详细内容，更多请关注编程学习网其它相关文章！