series 6 for dummies

access the schema of the user's default schema.This is Oracle's users and schemas, user and schema.Finally figuring out what the schema is, let's say why the schema is needed.Keep going.2 Why mode is requiredThere are so many things I don't just need to know what the concept is, but also why it's needed.So we'll remember more. and generate interest. will also prompt us to make changes and innovate.Why need the mode, we know that users need password talent landing, and the mode and the user is o

the 32-bit and 64-bit SQLite ODBC driver.The article is provided later, so as not to repeat the same, very painful.The installation process is simple, remember to remember: To install your power BI desktop corresponding to the 32-bit or 64-bit version.If you don't know what your power BI desktop version is, open: File->help->about, such as:2.Power BI Desktop Connection SQLiteLater I also prepared a SQLite provincial information file, you can see. Here's a look at the connection method:GetData,

following two types:(1) One is to lock the data before it is read, and prevent other transactions from modifying the data.(2) The other is not to add any locks, in the form of snapshot Snapshot "data version concurrency control" (multiversion Concurrency controls) referred to as MVCC.The stricter the transaction isolation level of the database, the smaller the concurrency side-effect, the greater the cost, because in essence, the transaction is "serialized" to some extent, which is inconsistent

commission NULL "isnull"SELECT * FROM EMP where comm is null;650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M01/86/EF/wKiom1fPEybRs8h8AAA6V_3wphw310.png "title=" 008. PNG "alt=" Wkiom1fpeybrs8h8aaa6v_3wphw310.png "/>Note : null cannot participate in = OperationNull can participate in NUMBER/DATE/VARCHAR2 type operationsQuery for employees with a non-null commission of "is notnull"SELECT * FROM EMP where comm are NOT null;Find employees who have no commissions and pay more than 1500SELEC

posted, the implementation of Sqlite.codefirst itself is relatively simple, I added the code is relatively simple, so there is no reference value in code, only the use and practical value. After all, the support for these features is only required for debug development and has no effect on SQLite itself and the EF provider. It's finally a relief, we can now use: SQL Server (CE), SQLite and MySQL for code first development, with the same entity definitions and configurations, and with the same c