Insert data
Each column assignment, you can omit the column name
INSERT INTO Product VALUES(value1,value2,DEFAULT,value3,NULL)
Only part of the column assignment, we need to add the column name. Column names is omitted, if there is a default value is the default value if no default value is NULL. If there is neither a default value of another non-null constraint, the execution fails
INSERT INTO Product (column1,column2,column3) VALUES(value1,value2,value3)
delete data
Empty table without deleting the table
DELETE FROM 表名
Delete table
DROP TABLE 表名
Update table
UPDATE table SET column 1 = value1, column 2 = value2 WHERE ...
If no WHERE, then all rows of the specified column will be changed.