mysql基礎(chǔ)語句大全

MySQL是一個開放源碼的關(guān)系型數(shù)據(jù)庫管理系統(tǒng)，使用SQL作為其查詢語言。它是Web開發(fā)中常用的數(shù)據(jù)庫管理系統(tǒng)之一。MySQL的語法十分豐富，可以執(zhí)行各種數(shù)據(jù)庫操作，包括創(chuàng)建、修改、刪除和查詢等。

MySQL的基礎(chǔ)語句可以分為以下幾類：

1. 數(shù)據(jù)庫操作語句：

• 創(chuàng)建數(shù)據(jù)庫：CREATE DATABASE database_name;
• 刪除數(shù)據(jù)庫：DROP DATABASE database_name;
• 使用數(shù)據(jù)庫：USE database_name;
• 顯示所有數(shù)據(jù)庫：SHOW DATABASES;
• 顯示某個數(shù)據(jù)庫的表：SHOW TABLES;

2. 表操作語句：

• 創(chuàng)建表：CREATE TABLE table_name (column1 datatype, column2 datatype, ...);
• 刪除表：DROP TABLE table_name;
• 修改表：ALTER TABLE table_name ADD column datatype;
• 修改表名：ALTER TABLE table_name RENAME TO new_table_name;

3. 數(shù)據(jù)操作語句：

• 插入數(shù)據(jù)：INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);
• 更新數(shù)據(jù)：UPDATE table_name SET column_name1 = value1, column_name2 = value2 WHERE condition;
• 刪除數(shù)據(jù)：DELETE FROM table_name WHERE condition;
• 查詢數(shù)據(jù)：SELECT column1, column2, ... FROM table_name WHERE condition;

4. 數(shù)據(jù)查詢語句：

• 查詢所有列：SELECT * FROM table_name;
• 按條件查詢：SELECT * FROM table_name WHERE condition;
• 指定查詢列：SELECT column1, column2, ... FROM table_name;
• 重命名列名：SELECT column1 AS alias FROM table_name;
• 按照某列排序：SELECT * FROM table_name ORDER BY column_name ASC|DESC;
• 分頁查詢：SELECT * FROM table_name LIMIT start, count;

5. 數(shù)據(jù)過濾語句：

• 模糊查詢：SELECT * FROM table_name WHERE column_name LIKE 'value%';
• 正則表達式查詢：SELECT * FROM table_name WHERE column_name REGEXP 'pattern';
• 范圍查詢：SELECT * FROM table_name WHERE column_name BETWEEN value1 AND value2;
• 空值判斷：SELECT * FROM table_name WHERE column_name IS NULL|NOT NULL;

6. 數(shù)據(jù)聚合語句：

• 求和：SELECT SUM(column_name) FROM table_name;
• 平均值：SELECT AVG(column_name) FROM table_name;
• 計數(shù)：SELECT COUNT(column_name) FROM table_name;
• 最大值：SELECT MAX(column_name) FROM table_name;
• 最小值：SELECT MIN(column_name) FROM table_name;
• 分組聚合：SELECT column1, COUNT(*) FROM table_name GROUP BY column1;

7. 數(shù)據(jù)聯(lián)接語句：

• 內(nèi)連接：SELECT * FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name;
• 左連接：SELECT * FROM table1 LEFT JOIN table2 ON table1.column_name = table2.column_name;
• 右連接：SELECT * FROM table1 RIGHT JOIN table2 ON table1.column_name = table2.column_name;

以上是MySQL的基礎(chǔ)語句大全，涵蓋了數(shù)據(jù)庫的創(chuàng)建、刪除、修改以及數(shù)據(jù)的插入、更新、刪除和查詢等常見操作。在實際開發(fā)中，我們需要根據(jù)具體需求來選擇合適的語句進行操作。通過熟練掌握這些語句，可以有效地操作和管理MySQL數(shù)據(jù)庫。