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ALIAS IN EAGLEFILER PDF
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ALIAS IN EAGLEFILER CODE
Here we discuss the introduction and how alias work in PostgreSQL and different examples and its code implementation.Version 1.9.1 of EagleFiler is now available.ĮagleFiler makes organizing and managing your information easy. SELECT s.firstname, s.branch, t.firstname Now we will add an alias for the ‘teacher’ table as ‘t’, have a look at the following example. So in this statement, we can use ‘s’ instead of the student table as it refers to the ‘student’ table. In the above statement for the ‘student’ table, we have created alias s. SELECT s.firstname, s.branch, teacher.firstname Let’s consider the following example to understand the table alias. It is acceptable to define aliases for the tables you want to give a temporary name and not for all tables. We generally use the alias on the table if we want to abbreviate the name to the table in order to make the queries more readable and shorter, or in the case of SELF JOIN, where we use the same table multiple times. SELECT firstname, MAX(salary) AS "high salary" If we have spaces in the alias name, we should enclose it with quotes. SELECT firstname, MAX(salary) AS "high_salary" It is acceptable to add quotes around the alias_name in PostgreSQL alias as follows: In this example, we have not added any space in, so it does not need to add quotes around the given alias_name. So, the column header of the second column will be displayed as ‘high_salary’. In the above example, the MAX(salary) is aliased as high_salary.
Illustrate the result of the above statement using the following snapshot. SELECT firstname, MAX(salary) AS high_salary
Like whenever we use functions like MAX, we can alias the result of the MAX function to make it easier to read. We specify the alias names to make the column headers more readable in the final result set. Now, illustrate the data inserted into the ‘teacher’ table with the following SQL statement’s help. INSERT INTO teacher (teacher_id, firstname, lastname, branch,salary) Now, insert some data into the ‘teacher’ table. Now, illustrate the data inserted into the ‘student’ table with the following SQL statement’s help. INSERT INTO student (rollno, firstname, lastname, branch, result, joining_date) Now, insert some data into thestudent’ table. Let’s create a table of name ‘student’ and ‘teacher’ to understand the PostgreSQL alias examples in detail: Example #1 Examples to Implement Alias in PostgreSQL Here we have specified the alias ‘ltn’ for a table ‘long_table_name’. We can use the alias for the long table name as follows:
The self join means the same table getting scanned multiple times to retrieve the data. The PostgreSQL Aliases are used to remove the ambiguity for self-joins. But it is not a best practice to have an alias name with spaces in case of aliasing a table. The PostgreSQL Alias name can have spaces.
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