实现“mysql 查询今年每天的日期”教程
整体流程
journey
title 查询今年每天的日期
section 整体流程
开始 --> 连接数据库 --> 构建查询语句 --> 执行查询 --> 获取结果 --> 结束
| 步骤 |
操作 |
| 1 |
连接数据库 |
| 2 |
构建查询语句 |
| 3 |
执行查询 |
| 4 |
获取结果 |
具体步骤
步骤 1：连接数据库
```sql
-- 连接数据库
mysql -u root -p
### 步骤 2：构建查询语句
```markdown
```sql
-- 构建查询今年每天的日期的语句
SELECT DATE_FORMAT( CURDATE() - INTERVAL (N-1) DAY, '%Y-%m-%d' ) AS date
FROM (
SELECT 1 AS N UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL
SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL
SELECT 9 UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL SELECT 12 UNION ALL
SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15 UNION ALL SELECT 16 UNION ALL
SELECT 17 UNION ALL SELECT 18 UNION ALL SELECT 19 UNION ALL SELECT 20 UNION ALL
SELECT 21 UNION ALL SELECT 22 UNION ALL SELECT 23 UNION ALL SELECT 24 UNION ALL
SELECT 25 UNION ALL SELECT 26 UNION ALL SELECT 27 UNION ALL SELECT 28 UNION ALL
SELECT 29 UNION ALL SELECT 30 UNION ALL SELECT 31
) N
WHERE N <= DAYOFYEAR( CURDATE() );
### 步骤 3：执行查询
```markdown
```sql
-- 执行查询
mysql> use your_database_name;
mysql> SELECT DATE_FORMAT( CURDATE() - INTERVAL (N-1) DAY, '%Y-%m-%d' ) AS date
-> FROM (
-> SELECT 1 AS N UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL
-> SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL
-> SELECT 9 UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL SELECT 12 UNION ALL
-> SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15 UNION ALL SELECT 16 UNION ALL
-> SELECT 17 UNION ALL SELECT 18 UNION ALL SELECT 19 UNION ALL SELECT 20 UNION ALL
-> SELECT 21 UNION ALL SELECT 22 UNION ALL SELECT 23 UNION ALL SELECT 24 UNION ALL
-> SELECT 25 UNION ALL SELECT 26 UNION ALL SELECT 27 UNION ALL SELECT 28 UNION ALL
-> SELECT 29 UNION ALL SELECT 30 UNION ALL SELECT 31
-> ) N
-> WHERE N <= DAYOFYEAR( CURDATE() );
### 步骤 4：获取结果
执行上述查询后，你将获得今年每天的日期列表。
## 结束
现在你已经学会了如何在 MySQL 中查询今年每天的日期。希望这篇教程对你有所帮助！
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**引用形式的描述信息：** 本文以一个经验丰富的开发者的身份，教授如何在 MySQL 中查询今年每天的日期。
