過濾數據

• • WHERE
  • 比較運算符
  • • 基本操作符
    • 其他比較運算符
    • • between..and
      • in
      • like
  • 邏輯運算符
  • 算數運算符

WHERE

SELECT employee_id, last_name, job_id, department_id FROM employees WHERE department_id = 90 ;

比較運算符

基本操作符

SELECT last_name, salary FROM employees WHERE salary <= 3000;

其他比較運算符

between…and

SELECT last_name, salary FROM employees WHERE salary BETWEEN 2500 AND 3500; # WHERE salary>=2500 AND salary<=3500;

in

SELECT employee_id, last_name, salary, manager_id FROM employees WHERE manager_id IN (100, 101, 201); # 無順序 # WHERE manager_id=100 OR manager_id=101 OR manager_id=201;

like

模糊查詢

邏輯運算符

算數運算符

總結

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