first() # using Flask-SQLAlchemy user = User.query.filter(User.username == 'susan').first() In release 2.0 this is considered the "old" way of executing queries. You can still run queries in this way, but the documentation refers to this interface as the "1.x Query API" or the "...
Virtual log file growth In previous versions of SQL Server, if the next growth is more than 1/8 of the current log size, and the growth is less than 64 MB, four VLFs were created. In SQL Server 2022 (16.x), this behavior is slightly different. Only one VLF is created if the grow...
Thejson_insert()function inSQLiteis used to insert new values into an existing JSON document. It takes three parameters: the JSON document to modify, aJSONpath specifying the location where the new value should be inserted, and the new value to insert. The function returns the modifiedJSONdocum...
It is the PRIMARY KEY of the table: its value must be unique in the column, and it cannot be null. Its values will AUTOINCREMENT: If a value for myTableId is not specified, the lowest unique integer greater than every other existing value is automatically used. For example, if the col...
Beginning with MySQL 8.4.0, the deprecated mysql_native_password authentication plugin is no longer enabled by default. To enable it, start the server with --mysql-native-password=ON (added in MySQL 8.4.0), or by including mysql_native_password=ON in the [mysqld] section of your MySQL co...
RDBMS can handle a larger amount of data as compared to DBMS, in a more efficient manner. It doesn’t have data redundancy and is used by larger organizations plus its data fetching rate is also higher. Examples – MySQL, SQL Server, PostgreSQL, etc. SQL vs NoSQL SQL (Structured Query ...
ROWID is of alias of an integer primary key: CREATETABLEtest1(idINTEGER, b TEXT,PRIMARYKEY(id)) INSERTINTOtest1 (id, b)VALUES(5,'five'); INSERTINTOtest1 (id, b)VALUES(6,'six'); INSERTINTOtest1 (b)VALUES('seven'); SELECTrowid, *FROMtest1; ...
Once a user account is created on an SQL node, the user and its privileges can be stored inNDBand thus shared between all SQL nodes in the cluster by issuing aGRANTstatement such as this one: GRANT NDB_STORED_USER ON *.* TO 'jon'@'localhost'; ...
Auto increment means that the SQL server itself will increase the PersonID by one each time. So, if you inserted another row right now, it would be “4,” and the row after that would be “5” and so forth. This is important because when writing an application, you would otherwise ne...
Is there a limit on the length of a database object name? How do I view the creation time of a table? How do I create indexes in parallel? How do I create an auto-increment column? Can I query the GaussDB memory usage through SQL statements? What are the differences between LIMIT 2...