MySQL01.sql · RainbowSea/SQL

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sql

MySQL01.sql

MySQL01.sql 1.13 KB

SELECT 1
FROM DUAL;

SELECT 2*3
FROM DUAL;

SELECT employee_id
FROM employees;

SELECT employee_id,last_name,department_id,salary
FROM employees;

SELECT *
FROM employees;

SELECT employee_id emp_id
FROM employees;

SELECT employee_id AS emp_id , 
 salary AS "工资"
FROM employees;

SELECT employee_id "emp_id",
 last_name "名字",
 department_id "部门"
FROM employees;

SELECT employee_id AS "emp_id",
 last_name AS "名字",
 department_id AS "部门id",
 salary*12 AS "年工资"
FROM employees;

SELECT *
FROM employees;

SELECT '腾讯' AS gongsi,
 last_name AS "姓名",
 salary*12 AS "年工资"
FROM employees;

SELECT department_id
FROM employees;

SELECT DISTINCT department_id
FROM employees;

SELECT department_id,DISTINCT last_name
FROM employees;

SELECT DISTINCT department_id,last_name
FROM employees;

SELECT *
FROM employees
WHERE last_name = 'king'; -- 字符串使用单引号

SELECT last_name , salary
FROM employees
WHERE last_name = 'king' AND salary > '9000.0';

SELECT salary
FROM employees;
WHERE salary >= '9000';

SELECT *
FROM ORDER;

SELECT *
FROM 'ORDER';

一键复制编辑原始数据按行查看历史

RainbowSea 提交于 2022年04月26日 23:11 +08:00 . SElECT 基本语句练习

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

SELECT 1
FROM DUAL;

SELECT 2*3
FROM DUAL;

SELECT employee_id
FROM employees;

SELECT employee_id,last_name,department_id,salary
FROM employees;

SELECT *
FROM employees;


SELECT employee_id emp_id
FROM employees;


SELECT employee_id AS emp_id , 
 salary AS "工资"
FROM employees;


SELECT employee_id "emp_id",
 last_name "名字",
 department_id "部门"
FROM employees;


SELECT employee_id AS "emp_id",
 last_name AS "名字",
 department_id AS "部门id",
 salary*12 AS "年工资"
FROM employees;


SELECT *
FROM employees;



SELECT '腾讯' AS gongsi,
 last_name AS "姓名",
 salary*12 AS "年工资"
FROM employees;


SELECT department_id
FROM employees;


SELECT DISTINCT department_id
FROM employees;

SELECT department_id,DISTINCT last_name
FROM employees;

SELECT DISTINCT department_id,last_name
FROM employees;


SELECT *
FROM employees
WHERE last_name = 'king'; -- 字符串使用单引号

SELECT last_name , salary
FROM employees
WHERE last_name = 'king' AND salary > '9000.0';

SELECT salary
FROM employees;
WHERE salary >= '9000';

SELECT *
FROM ORDER;

SELECT *
FROM 'ORDER';