CREATE TABLE Student ( ID CHAR (4) PRIMARY KEY, Name CHAR (8) NOT NULL, Sex CHAR (2), Age INT )
CREATE TABLE Student (
ID CHAR (4) PRIMARY KEY,
Name CHAR (8) NOT NULL,
Sex CHAR (2),
'2018','张三',男,21
NULL,'张三',NULL,21
'2018','张三',NULL,NULL
'2018',NULL,男,21
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