Definition of PostgreSQL SPLIT_PART()
PostgreSQL split_part function is used to split string into nth substring by using specified delimiter, the splitting of string is based on a specified delimiter which we have used. Splitting of the string using split_part function is start from left to right, it will always splitting the string from left to right.PostgreSQL split_part function is require three arguments as string, delimiter and position. String argument is state that string which have used to split, delimiter is used to split the string into nth part. Position states that which position string we want to return.
Syntax:
Below is the syntax of split_part function in PostgreSQL.
Split_part (String, delimiter, Position)
Select split_part (String (In this position column name as we have defined a string.), delimiter, Position), split_part (String (In this position column name as we have defined a string.), delimiter, Position), Column_nameN from table_name;
Parameter:
Below is the parameter description of above syntax.
- String: String is states that which string we have used to split using a split_part function in PostgreSQL. We can use any of the string to split it, we can also use a column name as a substring to split the data from column.
- Split_part (): PostgreSQL split_part function is used to split string into specified delimiter and return into result as nth substring, the splitting of string is based on a specified delimiter which we have used.
- Delimiter: Delimiter is used to split the string into sub parts by using a split_part function in PostgreSQL. We can split the string into number of parts using delimiter.
- Position: Position in split part function states that which position string we want to return using split_part function in PostgreSQL. The position will start from 1 and it should not be negative it is always positive integer.
- Select: Select is used to select column of table using split_part function in PostgreSQL. We can select a column using split_part function and split column string.
- Column 1 to Column N: Column name used to get the information from table. We can split the column data rows using split_part function in PostgreSQL.
- Table name: Table name is used to retrieve data from specified column using split_part function in PostgreSQL.
How PostgreSQL SPLIT_PART() Function Works?
Below is the working of PostgreSQL split_part function.
- Split part function is very important and useful in PostgreSQL to split string into nth parts.
- We need to define a position value as positive number, negative value is not allowed in position argument.
- We need to define greater that zero value at the time using split_part function in PostgreSQL.
- In below first example we have using a position is 1, after using position 1 it will display the value of string is X.
- After using value as 0 and -1 it will display the error as “ERROR: field position must be greater than zero”.
SELECT SPLIT_PART('X,Y,Z', ',', 1);
SELECT SPLIT_PART('X,Y,Z', ',', -1);
SELECT SPLIT_PART('X,Y,Z', ',', 0);
- It is used to split string into specified delimiter and return into result as nth substring, the splitting of string is based on a specified delimiter which we have used.
- String argument is states that which string we have used to split using a split_part function in PostgreSQL. We can use any of the string to split it, we can also use a column name as a substring to split the data from column.
- Delimiter argument is used to split the string into sub parts by using a split_part function in PostgreSQL. We can split the string into number of parts using delimiter.
- Position argument in split part function states that which position string we want to return using split_part function. The position will start from 1 and it should not be negative it is always positive integer.
- Splitting of the string using split_part function is start from left to right, it will always splitting the string from left to right.
- It is require three arguments as string, delimiter and position.
Example to Implement SPLIT_PART () Function in PostgreSQL
- Below is the example of split_part function in PostgreSQL are as follows.
- We have using example of employee table to describe example of split_part function in PostgreSQL. Below is the employee table are as follows.
select * from employee;
1. In the below example we have split ABBCCD string into three parts using delimiter. In the first part we have split string as AB in the second part split as BC and in the third part we split as CD.
SELECT SPLIT_PART('AB,BC,CD', ',', 1);
SELECT SPLIT_PART('AB,BC,CD', ',', 2);
SELECT SPLIT_PART('AB,BC,CD', ',', 3);
2. In the below example we have split the date of joining column as year, month and date wise into three columns.
SELECT emp_id, emp_name, emp_phone, emp_salary, split_part(date_of_joining::TEXT,'-',
1) AS Year, split_part(date_of_joining::TEXT,'-', 2) AS Month, split_part(date_of_joining::TEXT,'-', 3) AS Date FROM employee;
In above example we have split the date of joining column into three substring as date, year and month wise.
3. Below example shows that only display the month and year of employee joining from employee table.
SELECT emp_id, emp_name, emp_phone, emp_salary, split_part(date_of_joining::TEXT,'-',
1) AS Year, split_part(date_of_joining::TEXT,'-', 2) AS Month FROM employee;
Advantages of Using SPLIT_PART() Functions in PostgreSQL
- Split part function is used to split the string into nth part in PostgreSQL.
- By using a split_part function we can identify common data from table column.
- We can increase the quality of data by using split_part function in PostgreSQL.
- We can extract multiple substring from one string in PostgreSQL.
- Split_part function is very important and useful in PostgreSQL.
Conclusion
It is used to split string by using specified delimiter and return into result as nth substring, the splitting of string is based on a specified delimiter which we have used. Split_part function is require three arguments as string, delimiter and position.
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This is a guide to PostgreSQL SPLIT_PART(). Here we also discuss the Introduction and how postgresql split_part() function works? along with different examples and its code implementation. You may also have a look at the following articles to learn more –
