Moreover, the examples discussed in this guide are based on the Baeldung University database schema. 2. Adding a Comment When Creating a Table Let’s review how we can add column comments when creating tables in each database management system. 2.1. MySQL In MySQL, we use the COMMENT keywo...
The harder part is deciding what the structure of your database should be: what tables you need and what columns should be in each of them. You want a table that contains a record for each of your pets. This can be called the pet table, and it should contain, as a bare minimum,...
Often a script converts unstructured data in a file into a table, by first extracting the data using anEXTRACTexpression and then inserting it into a table after some optional transformations. In order to simplify the process, U-SQL provides the ability to create a table from a U-SQL qu...
In a nutshell, we simply selected all columns from a subquery that selectedcolumn1andcolumn2from anexisting_tabletable based on a setcondition. Later in this tutorial, we’ll explore this with practical examples using our Baeldung schema. 3.2. Using Alternative Syntax in SQL Server Here, let’...
Creating a dimension or SQL calendar table for business dates and fiscal periods might seem intimidating at first, but once you have a solid methodology in line, it can be very worthwhile. There are many ways to do this; some will subscribe to the idea that many of these date-related fact...
have an option to horizontally partition a table with up to 1000 partitions and the data placement is handled automatically by SQL Server. Horizontal partitioning is the process of dividing the rows of a table in a given number of partitions. The number of columns is the same in each ...
This SQL statement creates the tablebirdswith five fields, or columns, with commas separating the information about each column. Note that all the columns together are contained in a pair of parentheses. For each colum, we specify the name, the type, and optional settings. For instance, the ...
Example 4-3creates a range-partitioned global index onsale_monthfor the tables created in the previous examples. Each index partition is named but is stored in the default tablespace for the index. Example 4-3 Creating a range-partitioned global index table ...
4.4 Retrieving Information from a TableOnce you know how to enter SQL statements, you are ready to access a database. Suppose that you have several pets in your home (your menagerie) and you would like to keep track of various types of information about them. You can do so by creating...
Each job step is defined by using a Transact-SQL command batch. This example: Creates a Job object and adds the object to a Jobs collection to create a SQL Server Agent job. Gets the Tables collection of a Database object. For each Table object in the collection: Creates a JobStep ...