Different data typesPosted by: Sidney Kwakkel Date: August 17, 2010 11:58AM I am in the process of creating a database that holds my company's measurement data. There are three entities that I wish to relate Project Location Measurement Every Project has many Locations, and every ...
attribute promotion and demotion.Row-based replication supports attribute promotion and demotion between smaller data types and larger types. It is also possible to specify whether or not to permit lossy (truncated) or non-lossy conversions of demoted column values, as explained later in this sec...
Bug #21159 Optimizer: wrong result after AND with different data types Submitted: 19 Jul 2006 20:25Modified: 13 Sep 2006 2:22 Reporter: Peter Gulutzan Email Updates: Status: Closed Impact on me: None Category: MySQL Server: OptimizerSeverity: S3 (Non-critical) Version: 5.1.12-beta-...
Column('validss',mysql.ENUM('p', 'e', 'r')) ) The above codes are the basic vendor-specific types for the database to dialect the information from the users, which the database coder handles. 8. Custom Type The sqlalchemy also uses the existing methods to redefine the current data ...
In MySQL, you can nest a subquery inside the WHERE clause of an outer SQL SELECT statement.. The subquery can be added to further filter the result set using comparison operators like <,>, =, IN or BETWEEN, etc. The database management system executes the Subquery first and then uses it...
A system and method for transferring data between different types of systems, and in particular uses log-based replication to transfer data between, e.g. a MySQL database or system, and another type of database or system. In accordance with an embodiment, the system can be used to perform...
However, it should be safe to use --replicate-do-db for this purpose if you are using row-based replication only, since in this case the currently selected database has no effect on the option's operation. For example, to support the separation as shown in Figure 16.2, “Replicating Data...
就是可以自动消除相同字段的一种交,但是 MySQL 并没有实现这种交,如果你 像下面这样查 就会看到好多相同字段: SELECT*FROMcustomersASc, ordersASo, orderitemsASoiWHEREc.cust_id=o.cust_idANDoi.order_num=o.order_numANDprod_id='FB'; | cust_id |cust_name | cust_address | cust_city | cust_state...
Such an incompatible situation could occur if the table on the slave had been manually changed, or when replicating between different MySQL versions that have different data types. This OOM error was caused because the virtual temporary tables created for the row conversion were not being freed ...
In the last query, when I change the INNER query from GROUP BY customers.customerCountryCode to GROUP BY customers.customerID it also takes around 30 seconds. Anyone knows why? The customerCountryCode data type is varchar(2), the customerID is an unsgined mediumint. Is this causing ...