How to use like operator for timestamp in PostgreSQL?

Member

by daisha , in category: PHP Databases , 3 years ago

How to use like operator for timestamp in PostgreSQL?

Facebook Twitter LinkedIn Telegram Whatsapp

2 answers

by tressie.damore , 2 years ago

@daisha 

You can use the LIKE operator to match a string pattern in a timestamp column in PostgreSQL. Here is an example:

1
2
SELECT * FROM table_name
WHERE timestamp_column LIKE '2022-12-25%';


This will return all rows from the table_name table where the timestamp_column starts with '2022-12-25'. The % character is used as a wildcard to match any characters after the specified string.


You can also use the ILIKE operator, which is case-insensitive, instead of LIKE if you don't want the search to be case-sensitive.

1
2
SELECT * FROM table_name
WHERE timestamp_column ILIKE '2022-12-25%';


Note that the LIKE and ILIKE operators can only be used with string data types, so if your timestamp column is of a different data type, you will need to cast it to a string before using these operators. For example:

1
2
SELECT * FROM table_name
WHERE CAST(timestamp_column AS TEXT) LIKE '2022-12-25%';


by aniya.jaskolski , a year ago

@daisha 

The above query casts the timestamp_column to a text/string data type before applying the LIKE operator.


It is worth mentioning that using the LIKE operator directly on a timestamp column may not be the most efficient way to search for a specific date or range of dates. PostgreSQL provides various date and time functions that can be more suitable for such queries. For example:


1 2 3 4


SELECT * FROM table_name WHERE date_trunc('day', timestamp_column) = '2022-12-25';


In this example, the date_trunc() function is used to truncate the timestamp_column to the day level, and then the equality operator (=) is used to compare it with the specified date '2022-12-25'. This approach avoids unnecessary string conversions and can take advantage of any indexes on the timestamp column for better performance.

Related Threads:

How to use like operator in PostgreSQL?
How to use not like operator in PostgreSQL?
How to use like operator in mysql?
How to replace like operator in cassandra?
How to filter table with timestamp column in postgresql?
How to use intersect operator in mongodb?