Error Code: 1046. No database selected Select the default DB to be used by double-clicking its name in the SCHEMAS list in the sidebar. 其实就是未指定数据库, 在MySql中建立数据库后create database 可用 use 指定数据库 再进行创建表 或者使用 create table _ ③:[Err] 1046 - No database sel...
MySQL delivers: Transactional Data Dictionaryimplemented as a set of SQL tables stored in a single InnoDB tablespace. Common Table Expressionsalso known as WITH queries. Window Functionsto reduce code complexity and help developers be more productive. ...
MySQL delivers: Transactional Data Dictionaryimplemented as a set of SQL tables stored in a single InnoDB tablespace. Common Table Expressionsalso known as WITH queries. Window Functionsto reduce code complexity and help developers be more productive. ...
mysqlsh {MySQL user}@{IP address of server}/{schema name} This command will start MySQL Shell in JavaScript mode. It is essential to stay in this mode. Otherwise, the results may be different from what we expect. Checkingperformance_schema Before we can start looking at the queries run wi...
Encoding: A TextEncoding value that specifies the character set used to encode all queries sent to the server (default is null). CreateNavigationProperties: A logical (true/false) that sets whether to generate navigation properties on the returned values (default is true). NavigationPropertyNameGen...
查询| Queries 查询基础 常规查询 若要提交查询,请使用查询职能: 代码语言:javascript 复制 $this->db->query('YOUR QUERY HERE'); query()函数在运行“读取”类型查询时返回数据库结果对象,您可以使用该查询来显示结果。当“写入”类型的查询运行时,它只是返回TRUE或FALSE,取决于成功或失败。在检索数据时,您...
Entering Queries Creating and Using a Database Creating and Selecting a Database Creating a Table Loading Data into a Table Retrieving Information from a Table Getting Information About Databases and Tables Using mysql in Batch Mode Examples of Common Queries Using MySQL with Apache Rel...
tables is kept at a level of table_open_cache entries. The server autosizes the cache size at startup. To set the size explicitly, set the table_open_cache system variable at startup. MySQL may temporarily open more tables than this to execute queries, as described later in this section...
If your tables aren't indexed, setting the log_queries_not_using_indexes and log_throttle_queries_not_using_indexes parameters to ON might affect MySQL performance. All queries that run against these nonindexed tables are written to the slow query log. See the MySQL slow query log documentation...
Gan MySQL 02/11/2022 01:37AM Re: Domain Login possibility Peter Brawley 02/11/2022 09:51AM Instant DDL on ADD Column puts queries in opening tables state Sunny Nagra 02/02/2022 09:32AM Re: Instant DDL on ADD Column puts queries in opening tables state ...