teradata create table as select example

are document.body objects in the loop, the benefits will be considerable if they are modified by reference. Subsequently, I cached the Document object----in our test, the Document object was referenced 3,002 times. The modified code is as follows: View the third sample. The run time is only 2100ms, saving about 10% of the time. Using local variables instead of directly referencing the Document object saves an average of 0.4 milliseconds each time. A common way to optimize performance is to

The use of YII 2 framework migration is also very convenient, modern PHP development framework has this feature, the use of migration database migration function, the database operation, its significance is to record the version of Database modification, and facilitate the deployment of the project, the database rollback, You do not need to manually manipulate the database on the line. Create a migration To execute the YII command: PHP yii migrate/

Label:Create a table The Simple Way CREATE TABLE person (number INT (one), name VARCHAR (255), birthday DATE ); or a CREATE TABLE IF not EXISTS person (number INT one), name VARCHAR (255), birthday DATE ); To view the MySQL creation tabl