使用场景1 – (Query语句): 需求:把"hero_title"字段中所有的"之"换成" - "来展示,SQL如下: SELECTREPLACE(hero_title,'之',' - ')as repl_title,hero_name,price from LOL; 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql>SELECTREPLACE(hero_title,'之',' - ')asrepl_title,hero_name...
constmysql=require('mysql');constconnection=mysql.createConnection({host:'localhost',user:'root',password:'password',database:'mydatabase'});connection.connect((err)=>{if(err)throwerr;console.log('Connected!');});constreplaceData=(table,column,oldValue,newValue)=>{constquery=`UPDATE${table}...
insert ignore into test_data(xid,name) values(1,'aaa');Query OK, 0 rows affected, 1 warning (0.01 sec)mysql--root@localhost:test 18:58:13>>show warnings;+---+---+---+| Level | Code | Message |+---+---+---+| Warning | 1062 | Duplicate entry '1' for key 'xid' |+--...
I have sql query with two in() subqueries, they are returning correct 10 sorted results, but complete query it's terrible slow, over 5 minutes waiting. SELECT id, title, alias FROM content WHERE published = '1' AND typ = 'actual' AND id IN ( SELECT content_id FROM catego...
query="SELECT REPLACE(name, 'Tom', 'John') FROM users" 1. 3. 执行查询语句 现在,你需要执行查询语句并获取查询结果。可以使用以下代码执行查询: cursor=cnx.cursor()# 执行查询语句cursor.execute(query)# 获取查询结果results=cursor.fetchall() ...
mysql >>select * from test1; +---+---+ | id | age | +---+---+ | 2 | 2 | | 3 | 3 | +---+---+ 2 rows in set (0.00 sec) mysql >>replace into test1 values (6,3); Query OK, 2 rows affected (0.00 sec) mysql >>select * from test1; +---+---+ | id | ag...
in set (0.00 sec) root@test02:31:54>replace into luo values(1,10000,4,5);---已经存在记录,且PK同时冲突的时候,相当于先delete再insert Query OK, 2 rows affected (0.00 )---affect_rows是2,是delete和insert行数的总和 root@test 02:32:02>select * fromlingluo; +---+---+---+-...
mysql> insert ignore intot(id, num)values(1,101); Query OK, 0 rows affected (0.00 sec) mysql> select * from t; +---+---+ | id | num | +---+---+ | 1 | 100 | +---+---+ 1 row in set (0.00 sec) mysql> (2)replace...
mysql> update a set name = replace(name,'-','='); Query OK,3rows affected (0.03sec) Rowsmatched:3Changed:3Warnings:0 mysql> select * from a; +---+---+ | id |name| +---+---+ |1| xiaofei=a | | 2 |ceshi=b| |3| ce...
in set (0.00 sec) root@test 04:20:43>replace into u (id,d) values(7,232); Query OK, 3 rows affected (0.01 sec)---注意这里affect_rows是3,因为主键7已经存在,唯一索引232已经存在,所以需要删除id为7和8的行,然后插入新行 root@test 04:20:52>select * from u; +---+---+---+ | ...