DATE_ADD功能不會更新工作

Question

我想下面的SQL：

update Sales_details set due_date = DATE_ADD(last_sale_date, INTERVAL 35 DAY) where task = 230 

，並得到了以下錯誤

syntax error: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTERVAL35DAY) FROM Sales_details WHERE task = 230' at line 1

我試過下面的SQL和它的正常工作：

select last_sale_date, DATE_ADD(last_sale_date, INTERVAL 35 DAY) from Sales_details where task = 230 

爲什麼DATE_ADD不起作用Update聲明？

Answer 1

適用於mysql！你的語法錯誤車道您使用的是SQLSERVER的MySQL的句法，

請檢查ADDDATE的語法SQLSERVER

SQL Server DATEADD() Function 
DATEADD(datepart,number,date) 


MySQL DATE_ADD() Function 
DATE_ADD(date,INTERVAL expr type) 


mysql> select first_name,birth_date from students where first_name = 'Dale'; 
+------------+------------+ 
| first_name | birth_date | 
+------------+------------+ 
| Dale  | 1959-03-29 | 
+------------+------------+ 
1 row in set (0.00 sec) 

mysql> update students set birth_date = DATE_ADD(birth_date,interval 35 DAY) where first_name = 'Dale'; 
Query OK, 1 row affected (0.00 sec) 
Rows matched: 1 Changed: 1 Warnings: 0 

mysql> select first_name,birth_date from students where first_name = 'Dale'; +------------+------------+ 
| first_name | birth_date | 
+------------+------------+ 
| Dale  | 1959-05-03 | 
+------------+------------+ 
1 row in set (0.00 sec) 

mysql>