Contents
- 1 Can we use same sequence for multiple tables?
- 2 Which of the following are correct about views in SQL Server?
- 3 How do I find the order of a table in PostgreSQL?
- 4 Which is an example of a sequence in PostgreSQL?
- 5 How does the owned by clause work in PostgreSQL?
- 6 What does the increment do in PostgreSQL?
Can we use same sequence for multiple tables?
I found the answer: “Sequence numbers are generated independently of tables, so the same sequence can be used for one or for multiple tables.”
Which of the following are correct about views in SQL Server?
The view is the virtual tables that are created to restrict access to the data and protect intricate or sensitive data. Virtual tables can improve the query response time by structuring the data in such a way that users find intuitive. Hence, all the above statements are correct for views.
How do I find the order of a table in PostgreSQL?
Typically a sequence is named as ${table}_id_seq . Simple regex pattern matching will give you the table name. Note, that starting from PostgreSQL 8.4 you can get all information about sequences used in the database via: SELECT * FROM information_schema.
What is a sequence table in PostgreSQL?
A sequence in PostgreSQL is a user-defined schema-bound object that generates a sequence of integers based on a specified specification. To create a sequence in PostgreSQL, you use the CREATE SEQUENCE statement.
How to drop multiple sequences at once in PostgreSQL?
In case you want to drop multiple sequences at once, you can use a list of comma-separated sequence names. Then, use the CASCADE option if you want to recursively drops objects that depend on the sequence, and objects that depend on the dependent objects and so on. This statement drops the table order_details.
Which is an example of a sequence in PostgreSQL?
The orders of numbers in the sequence are important. For example, {1,2,3,4,5} and {5,4,3,2,1} are entirely different sequences. A sequence in PostgreSQL is a user-defined schema-bound object that generates a sequence of integers based on a specified specification. To create a sequence in PostgreSQL, you use the CREATE SEQUENCE statement.
How does the owned by clause work in PostgreSQL?
The OWNED BY clause allows you to associate the table column with the sequence so that when you drop the column or table, PostgreSQL will automatically drop the associated sequence. Note that when you use the SERIAL pseudo-type for a column of a table, behind the scenes, PostgreSQL automatically creates a sequence associated with the column.
What does the increment do in PostgreSQL?
The increment specifies which value to be added to the current sequence value to create new value. A positive number will make an ascending sequence while a negative number will form a descending sequence. The default increment value is 1. Define the minimum value and maximum value of the sequence.