Creating a table from an existing table is more common than you might think. You may need to create a copy of a table, but not the entire database. This will allow you to practice manipulating the data in the table without affecting the production table. You may also want to create a ...
Summary:SQL Server 2005 implemented the concept of a database object schema. A schema is a distinct namespace to facilitate the separation, management, and ownership of database objects. It removed the tight coupling of database objects and owners to improve the security administration of database...
It’s a best practice to prefix al the columns in the SELECT statement with the table alias, as it will make clear of which table each column comes from. This avoids any confusion by people reading your query, especially if they’re not familiar with the database design. LEFT OUTER JOIN...
Using non-parameterized queries when that isn't necessary isn't a best practice. An example is in the case of ad hoc analysis. Cached plans can't be reused, which forces Query Optimizer to compile queries for every unique query text. For more information, see Guidelines for using ...
In practice, this should reduce cases where customers have seen performance issues on queries where newly inserted rows are queried frequently but where the statistics hadn't been updated to include those values. Trace 2371 is OFF by default in SQL Server 2014 (12.x). Trac...
or heaps. The performance for six distinct scenarios where DML operations are performed on these tables are measured and detailed observations presented. This white paper provides best practice recommendations on the merits of the two types of table organization, along with examples of when you might...
who works mostly with BigQuery’s StandardSQL or PostgreSQL, this meant some of the techniques I would normally apply wouldn’t work. This was frustrating at first, but at the same time it’s a good chance to practice other techniques that you might not think of when using the variant of...
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If you'd like to use SQL Practice Problems on a Mac, you'll need to purchase the Professional package. The Professional package includes the MySQL edition (as well as other features, including an additional problem set). MySQL can be installed on the Macintosh. SQL Server can not be instal...
SQL Server 2008 introduces Policy-Based Management, which makes it possible to declare policies (such as "all log files must be stored on a disk other than the data disk") in one location and then apply them to multiple servers. So a (somewhat recursive) best practice is to set up best...