SQL에 어떤 문제가 있습니까?

Question

CREATE TABLE IF NOT EXISTS customers (customer_id TEXT NOT NULL, time_stamp TIMESTAMP NOT NULL, customer_info TEXT), PRIMARY KEY (time_stamp)

오류는 기본 키 열은 CREATE TABLE 괄호 내에 정의 될 필요가

mysql> CREATE TABLE IF NOT EXISTS customers (customer_id TEXT NOT NULL, time_stamp TIMESTAMP NOT NULL, 
     customer_info TEXT), PRIMARY KEY (time_stamp); 
ERROR 1064 (42000): 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 ' PRIMARY KEY (time_stamp)' at line 1 

Answer 1

입니다 :

CREATE TABLE IF NOT EXISTS customers (
    customer_id TEXT NOT NULL, 
    time_stamp TIMESTAMP NOT NULL, 
    customer_info TEXT, 
    PRIMARY KEY (time_stamp) 
) 

내가 궁금 왜 customer_id 교환 형을하지 않았다 데이터 유형 및 따라서 기본 키 열 ...