mysql基本操作

新建資料庫

create database learn;

show databases;

+--------------------+

| database           |
+--------------------+
| information_schema |
| learn              |
| mysql              |
| performance_schema |
| stock              |
| sys                |
+--------------------+
6 rows in set (0.00 sec)

use learn;

create table test(id int, title char(20), uid int);

show tables;

+-----------------+

| tables_in_learn |
+-----------------+
| test            |
+-----------------+
1 row in set (0.00 sec)

insert into  test(title,uid) values ('123465','1001');

insert into  test(title,uid) values ('123465','1002');

select * from test limit 1;

+------+--------+------+

| id   | title  | uid  |
+------+--------+------+
| null | 123465 | 1001 |
+------+--------+------+
1 row in set (0.00 sec)

select * from test

+------+--------+------+

| id   | title  | uid  |
+------+--------+------+
| null | 123465 | 1001 |
| null | 123465 | 1002 |
+------+--------+------+
2 rows in set (0.00 sec)

alter table test add primary key(uid);

replace into test(title,uid) values ('1234657','1003');

select *from test ;

+------+---------+------+

| id   | title   | uid  |
+------+---------+------+
| null | 123465  | 1001 |
| null | 123465  | 1002 |
| null | 1234657 | 1003 |
+------+---------+------+
3 rows in set (0.00 sec)

replace into test(title,uid) values ('love','1001');

mysql> select *from test ;

+------+---------+------+
| id   | title   | uid  |
+------+---------+------+
| null | love    | 1001 |
| null | 123465  | 1002 |
| null | 1234657 | 1003 |
+------+---------+------+
3 rows in set (0.00 sec)

drop table test;

query ok, 0 rows affected (0.01 sec)

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