What are the conversion functions in SQL?

Asked By: Titel Radley | Last Updated: 5th April, 2020
Category: technology and computing databases
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SQL Conversion functions are single row functions which are capable of typecasting column value, literal or an expression . TO_CHAR, TO_NUMBER and TO_DATE are the three functions which perform cross modification of data types.

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Also to know is, what is the convert function in SQL?

In SQL Server (Transact-SQL), the CONVERT function converts an expression from one datatype to another datatype. If the conversion fails, the function will return an error. Otherwise, it will return the converted value.

Likewise, what is conversion function give example? Conversion functions are used to convert a value from one format to another. An example would be converting a numeric value into a string or converting the string back into a numeric value. These functions are extremely useful for switching values between various formats.

Furthermore, what is a conversion function?

Conversion functions convert a value from one datatype to another. Generally, the form of the function names follows the convention datatype. TO datatype. The first datatype is the input datatype. The second datatype.

What is the difference between To_char and To_date functions in SQL?

The TO_CHAR function converts numeric and date information into characters, while TO_NUMBER and TO_DATE convert character data into numbers and dates, respectively. A date column cannot store random characters or numbers. However, a character equivalent of both number and date can be stored inside a VARCHAR2 column.

23 Related Question Answers Found

How can I compare two dates in SQL query?

The right way to compare date only values with a DateTime column is by using <= and > condition. This will ensure that you will get rows where date starts from midnight and ends before midnight e.g. dates starting with '00:00:00.000' and ends at "59:59:59.999".

What is To_date in SQL?

In Oracle, TO_DATE function converts a string value to DATE data type value using the specified format. In SQL Server, you can use CONVERT or TRY_CONVERT function with an appropriate datetime style.

What is To_number in SQL?

TO_NUMBER function. The TO_NUMBER function converts a character value to a numeric datatype. If the string being converted contains nonnumeric characters, the function returns an error.


The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

Can we convert varchar to date in SQL?

3 Answers. There is too much precision in the varchar to be converted into datetime. DATETIME only allows three places of millisecond precision. You'll either need to trim the trailing places beyond the first three milliseconds or if you're using any version of SQL Server 2008 or later you can use DATETIME2.

What is To_char?

The Oracle TO_CHAR() function converts a DATE or INTERVAL value to a string in a specified date format. The Oracle TO_CHAR() function is very useful for formatting the internal date data returned by a query in a specific date format.

What is the difference between varchar and nvarchar?

Nvarchar stores UNICODE data. If you have requirements to store UNICODE or multilingual data, nvarchar is the choice. Varchar stores ASCII data and should be your data type of choice for normal use. Regarding memory usage, nvarchar uses 2 bytes per character, whereas varchar uses 1.

What is Nvarchar in SQL?

More on SQL Server development:
The "N" in NVARCHAR means uNicode. Essentially, NVARCHAR is nothing more than a VARCHAR that supports two-byte characters. The most common use for this sort of thing is to store character data that is a mixture of English and non-English symbols -- in my case, English and Japanese.

What is the return type of the conversion operator?

What is the return type of the conversion operator? Explanation: Conversion operator doesn't have any return type not even void. Explanation: It is used to check that operators and operands are compatible after conversion.

What are SQL functions?

SQL functions are simply sub-programs, which are commonly used and re-used throughout SQL database applications for processing or manipulating data. All SQL database systems have DDL (data definition language) and DML (data manipulation language) tools to support the creation and maintenance of databases.

What is type conversion Python?

Type Conversion is the conversion of object from one data type to another data type. Implicit Type Conversion is automatically performed by the Python interpreter. Explicit Type Conversion is also called Type Casting, the data types of object are converted using predefined function by user.

What is To_char in MySQL?

TO_CHAR - Convert Datetime to String - Oracle to MySQL Migration. In Oracle, TO_CHAR function converts a datetime value to string using the specified format. In MySQL, you can use DATE_FORMAT function. Note that the TO_CHAR and DATE_FORMAT format strings are different.

What is SQL Sysdate?

SYSDATE returns the current date and time set for the operating system on which the database resides. In distributed SQL statements, this function returns the date and time set for the operating system of your local database. You cannot use this function in the condition of a CHECK constraint.

What is conversion function explain with example in C++?

Conversion functions (C++ only) You can define a member function of a class, called a conversion function, that converts from the type of its class to another specified type. Conversion functions have no arguments, and the return type is implicitly the conversion type. Conversion functions can be inherited.

What is cast in Oracle?

The Oracle CAST function converts one data type to another. The CAST function can convert built-in and collection-typed values into other built-in or collection typed values. For this use of CAST, type_name and/or operand must be of (or evaulate to) a built-in datatype or collection type .

What is string function SQL?

SQL Server String Functions. A table-valued function that splits a string into rows of substrings based on a specified separator. STUFF. Delete a part of a string and then insert another substring into the string starting at a specified position.

What are aggregate functions in SQL?

Aggregate functions in SQL. In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning.