We are in the world dealing with heterogeneous data. The data type conversion functions commonly used specially to meet the data standards of the target objects or systems. The conversion of SQL data types, in this process, can be implicit or explicit. When the SQL data types are different, they will go through a process called type-casting. In order to perform operations or comparisons or transformation between data in a SQL Server database, the SQL data types of those values must match. So let’s take a closer look at the SQL conversion functions SQL CAST and SQL CONVERT in detail. In addition to working with data, there are some built-in functions can be used to convert the data. Sometimes we need to convert data between different SQL data types. You can view EDUCBA’s recommended articles for more information.This article is an effort to discuss SQL Cast and SQL Convert functions as a follow-up to previous articles, in which we’ve discussed several SQL tips such as SQL Date, SQL Coalesce, SQL Union, SQL Join, SQL Like, SQL String etc. We hope that this EDUCBA information on “SQL TO_DATE()” was beneficial to you. We can clearly observe that the birth_dates have been successfully converted to standard date format (YYYY-MM-DD) using the to_date() function. We can use the following SELECT statement to fetch records from the students’ table. Now, let us check if the birth_dates for the given students have been inserted in the required format. We have to use to_date() to convert it into standard YYYY-MM-DD format, as shown in the code snippet given above. The fourth query has birth_date written in Year, week number, and weekday format. The first three birth_dates are in familiar formats, as we have already discussed examples based on them. In these queries, the given birth_date is not in the standard PostgreSQL date format. INSERT INTO students(first_name, last_name, birth_date) Now let us try to insert data records in the “students” table using the following queries. Student_id INT GENERATED BY DEFAULT AS IDENTITY, We can use the following code snippet to perform the given task. In order to illustrate the uses of the to_date() function, let us create a dummy “students” table. SQL query to illustrate the use of the to_date() function in INSERT statements. The above-mentioned query returns the input string in YYYY-MM-DD date format in the MYSQL database. So, let us try some examples which will work there as well. Since the SQL server and MYSQL do not have to_date() as a built-in function, we cannot use it there. Great, we just learned to convert character strings into date data type using the to_date() function. In PostgreSQL, we can simply convert a character string written in date format to date data type without using the to_date() function in the following way. This can be solved by using the to_date function with the following set of arguments. We can sometimes have date information mixed with a timestamp string. Suppose we have some entries which are in shorthand format like ‘070920,’ and we want to convert it into YYYY-MM-DD format. We can use the following piece of code to perform the task. Next, suppose we have some date information written in text format like the one in this example. Suppose you want to convert ‘20200526’ into YYYY-MM-DD format (stands for 4 characters of the year, followed by two characters of month and day each.) We can use the to_date() function in the following manner. Datetime format: The specific format based on date specifiers in which the mentioned text is written.įollowing are the examples are given below: Example #1īasic SQL queries to illustrate the working of to_date() function in PostgreSQL and Oracle SQL databases.Text: Data value in character data types like char, text, varchar, nchar, varchar, etc., that has to be converted into date time format.The syntax for STR_TO_DATE() function in MYSQL is as follows : STR_TO_DATE(text, datetime format) The syntax for the CONVERT() function in the SQL server is as follows : CONVERT(datetime, text) The basic syntax for using the above-mentioned date conversion function is as follows : to_date(text, datetime format)
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