查
SELECT [ * | all | column1,column2 ]
FROM table1 [ ,table2 ]
[ WHERE condition ]
[ GROUP BY column1 ]
[ ORDER BY column2(asc,desc) ]
多表联查
SELECT employee_tbl.emp_name, employee_pay_tbl.position
FROM employee_tbl, employee_pay_tbl
WHERE employee_tbl.emp_id = employee_pay_tbl.emp_id
插入
INSERT INTO table_name
VALUES(value1,value2,…...)
修改
UPDATE table_name
SET column_name = ‘value’
[WHERE condition]