--查詢對應的列 大于5000 select employee_id,last_name,salary from employees where salary>5000

運行結果

--查詢對應的日期 select last_name,hire_date from employees where hire_date='7-6月-1994' --查詢對應的日期 select last_name,hire_date from employees --where hire_date='7-6月-1994' where to_char(hire_date,'yyyy-mm-dd')='1994-06-07'

運行結果

比較運算

--員工的工資大于4000并且小魚7000 select employee_id,last_name,salary from employees where salary between 4000 and 7000

運行結果

--員工的部門 70 80 90 select last_name,department_id,salary from employees where department_id in(70,80,90)

運行結果

--模糊查詢 查詢公司員工的名字含有a的有誰 select last_name,department_id,salary from employees where last_name like '%a%'

運行結果

--名字的第二位是字符a select last_name,department_id,salary from employees where last_name like '_a%'

--員工名字中含有下劃線的 select last_name,department_id,salary from employees where last_name like '%\_%' escape '\'

運行結果

空值

--查詢空值 select last_name,department_id,salary,commission_pct from employees where commission_pct is null

運行結果

--查詢部門80 并且工資小魚5000 select last_name,department_id,salary,commission_pct from employees where department_id='80' and salary<=8000

運行結果

優先級

--排序 從高到低 select last_name,department_id,salary,commission_pct from employees where department_id='80'order by salary desc

運行結果

--排序 從高到低 雙排序 select last_name,department_id,salary,commission_pct from employees --where department_id='80' order by salary desc,last_name desc

運行結果

總結

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