将employees表的所有员工的last_name和first

SQL226. 将employees表的所有员工的last_name和first_name拼接起来作为Name

emp_no	birth_date	first_name	last_name	gender	hire_date
10001	1953-09-02	Georgi	Facello	M	1986-06-26
10002	1964-06-02	Bezalel	Simmel	F	1985-11-21
10003	1959-12-03	Parto	Bamford	M	1986-08-28
10004	1954-05-01	Chirstian	Koblick	M	1986-12-01
10005	1955-01-21	Kyoichi	Maliniak	M	1989-09-12
10006	1953-04-20	Anneke	Preusig	F	1989-06-02
10007	1957-05-23	Tzvetan	Zielinski	F	1989-02-10
10008	1958-02-19	Saniya	Kalloufi	M	1994-09-15
10009	1952-04-19	Sumant	Peac	F	1985-02-18
10010	1963-06-01	Duangkaew	Piveteau	F	1989-08-24
10011	1953-11-07	Mary	Sluis	F	1990-01-22

请将employees表的所有员工的last_name和first_name拼接起来作为Name，中间以一个空格区分。

(注：sqllite,字符串拼接为 || 符号，不支持concat函数，mysql支持concat函数)。

输入描述

无

输出描述

Name
Facello Georgi
Simmel Bezalel
Bamford Parto
Koblick Chirstian
Maliniak Kyoichi
Preusig Anneke
Zielinski Tzvetan
Kalloufi Saniya
Peac Sumant
Piveteau Duangkaew
Sluis Mary

示例1

输入:

drop table if exists  `employees` ; 
CREATE TABLE `employees` (
  `emp_no` int(11) NOT NULL,
  `birth_date` date NOT NULL,
  `first_name` varchar(14) NOT NULL,
  `last_name` varchar(16) NOT NULL,
  `gender` char(1) NOT NULL,
  `hire_date` date NOT NULL,
  PRIMARY KEY (`emp_no`));
INSERT INTO employees VALUES(10001,'1953-09-02','Georgi','Facello','M','1986-06-26');
INSERT INTO employees VALUES(10002,'1964-06-02','Bezalel','Simmel','F','1985-11-21');
INSERT INTO employees VALUES(10003,'1959-12-03','Parto','Bamford','M','1986-08-28');
INSERT INTO employees VALUES(10004,'1954-05-01','Chirstian','Koblick','M','1986-12-01');
INSERT INTO employees VALUES(10005,'1955-01-21','Kyoichi','Maliniak','M','1989-09-12');
INSERT INTO employees VALUES(10006,'1953-04-20','Anneke','Preusig','F','1989-06-02');
INSERT INTO employees VALUES(10007,'1957-05-23','Tzvetan','Zielinski','F','1989-02-10');
INSERT INTO employees VALUES(10008,'1958-02-19','Saniya','Kalloufi','M','1994-09-15');
INSERT INTO employees VALUES(10009,'1952-04-19','Sumant','Peac','F','1985-02-18');
INSERT INTO employees VALUES(10010,'1963-06-01','Duangkaew','Piveteau','F','1989-08-24');
INSERT INTO employees VALUES(10011,'1953-11-07','Mary','Sluis','F','1990-01-22');

输出:

Facello Georgi
Simmel Bezalel
Bamford Parto
Koblick Chirstian
Maliniak Kyoichi
Preusig Anneke
Zielinski Tzvetan
Kalloufi Saniya
Peac Sumant
Piveteau Duangkaew
Sluis Mary

原站题解

Sqlite 解法, 执行用时: 9ms, 内存消耗: 3192KB, 提交时间: 2021-03-05

select (last_name || ' ' || first_name) as name
from employees

Sqlite 解法, 执行用时: 10ms, 内存消耗: 3176KB, 提交时间: 2020-10-30

select e.last_name || ' ' || e.first_name as name
from employees e

Sqlite 解法, 执行用时: 10ms, 内存消耗: 3180KB, 提交时间: 2021-03-14

select e.last_name || ' '|| e.first_name as name from employees as e

Sqlite 解法, 执行用时: 10ms, 内存消耗: 3184KB, 提交时间: 2021-06-15

select last_name || ' ' || first_name from employees;

Sqlite 解法, 执行用时: 10ms, 内存消耗: 3192KB, 提交时间: 2021-05-24

select last_name || ' ' || first_name as Name
from employees;

详情