Introduction to Redshift rename table
Basically, Redshift is a cloud base database and it provides different types of functionality to the user. The rename table is one of the functionalities provided by Redshift. Normally we can use the alter command to rename the table, the alter command comes under the DDL category. By using the alter command we can rename an existing table or we can say that we can modify the definition of the existing table as per user requirement. As well as we can add the column as per requirement. The alter command we can use externally to change the definition of the table that is set by the create table command.
alter table required existing table name rename to new specified table name;
In the above syntax, we use alter table command to rename the existing table name with different parameters as follows.
specified name of existing table name: It is used to indicate the existing table that we need to change.
rename to: It is a keyword and used to rename the existing table name.
new specified table name: New specified table name means new table name that we need to assign the existing table name as per user requirement.
How to rename the table in Redshift?
Now let’s see how to rename the table command works in Redshift as follows.
Basically, first understanding the database is the fundamental and significant advance that will set up your data set plan on a strong establishment. In light of your database understanding, you can use numerous conditions for your potential benefit just as having the option to settle on educated choices and a reasonable execution vision. The database assists you with setting power over different boundaries, including your normal database stockpiling and even how well questions perform. Set aside an effort to completely comprehend your database and the current connections before you go on to building your inquiries.
Preceding making your data set, you need to set up your Amazon redshift’s bunch and guarantee that everything is going and all around associated with your SQL customer apparatus. A solitary bunch can have numerous database bases.
Suppose you need to assemble a data set for your internet business; first, you’ll need to interface with your underlying data set made when you dispatched your group.
Now let’s see how we can load data into a database as follows.
First, we need to create the database that we want by using the above-mentioned syntax. After that, we need to create the table inside the newly created table by using create table command. After successful creation of the table, we can perform the different operations such as select, insert and drop as per user requirement.
After the successful creation of the table, we are able to rename the existing table as per user requirements. In another word, we can say that we can apply the alter command.
Now let’s see, what are the different terms we need to consider during the rename table operation as follows.
- The new name of the specified table must be unique, that means the name of the table does not already exist otherwise it will get an error like the name is already used.
- When we need to rename the table name we must have the privilege to rename the table that means we must either be the database owner or the table owner.
- All data definition language-related queries we can execute in auto-commit mode, which means once we rename the table name then we are not able to revert it back.
- If the table consists of a view or foreign key that references the specified table and we need to rename that table at that time it shows the error message. If there is any trigger or constraint then it shows the error message.
- If there is an open cursor and that references to the predetermined table in the present circumstance the rename articulation isn’t working.
Now let’s see the different examples of rename tables in Redshift for better understanding as follows.
Before the execution of the rename table command we need a table so let’s create the table first by using the following create table statement as follows.
create table product(
product_name varchar(255) not null,
product_cost decimal(15,2) not null,
primary key (product_id));
In the above statement, we utilized a make table explanation to make another table that is the item or table, here we made an item that is a new table with various traits, for example, product_id, product_name, product_cost with various information types as displayed in the above proclamation. The final output or we can say the final result of the above statement we can illustrate by using the following screenshot as follows.
Now we are able to perform the rename command on the existing table as follows.
Suppose the user need to rename the existing name that is the product to product_demo at that time we can use the following statement
alter table product rename to product_demo;
In the above statement, we utilize the modified table order to rename the current table name, here the item is the current table name that we need to rename and we need to relegate the new name for that table that is product_demo as displayed in the above proclamation. The final output or we can say the final result of the above statement we can illustrate by using the following screenshot as follows.
So in this way, we can perform the rename table command with help of altering as well as we can also perform the different operations by using alter such as add column, rename column name, etc.
We hope from this article you learn more about the Redshift rename table. From the above article, we have learned the basic concept as well as the syntax of the Redshift rename table and we also see the different examples of the Redshift rename table. From this article, we learned how and when we use the Redshift rename table.
This is a guide to Redshift rename table. Here we discuss the basic concept as well as the syntax of the Redshift rename table and we also see the different examples. You may also have a look at the following articles to learn more –