Welcome to our SQL Conversion Functions tutorial! Today, we'll learn how to convert data types in SQL using various built-in functions. These functions are essential for making your data more versatile and practical for real-world projects. Let's get started!
SQL Conversion Functions are used to convert one data type to another within a SQL statement. They help in ensuring compatibility and consistency of data when dealing with various data types.
In this section, we'll learn how to convert between different number types using SQL Conversion Functions.
CAST() and CONVERT() functionsThese functions are used to convert a numeric value from one data type to another.
-- Example 1: Converting Integer to Float
CAST(4 AS FLOAT) AS int_to_float;
-- Result: 4.0
-- Example 2: Converting Float to Integer
CAST(3.8 AS INTEGER) AS float_to_int;
-- Result: 3š Note: Always be careful when converting between number types as precision may be lost during the conversion.
ABS() functionThe ABS() function returns the absolute value of a number.
-- Example: Absolute Value of a number
ABS(-5) AS abs_example;
-- Result: 5In this section, we'll learn how to convert between different date and time types using SQL Conversion Functions.
CAST() and CONVERT() functionsThese functions can be used to convert a date or time value from one data type to another.
-- Example 1: Converting Date to Timestamp
CAST('2022-01-01' AS TIMESTAMP) AS date_to_timestamp;
-- Result: 2022-01-01 00:00:00.000
-- Example 2: Converting Timestamp to Date
CAST(CURRENT_TIMESTAMP AS DATE) AS timestamp_to_date;
-- Result: current dateš Note: Remember to use the appropriate format when converting dates and times to ensure compatibility and consistency.
DATE_FORMAT() functionThe DATE_FORMAT() function is used to format a date or time value as a string.
-- Example: Formatting a date
DATE_FORMAT(CAST('2022-01-01' AS DATE), '%d-%m-%Y') AS date_format_example;
-- Result: 01-01-2022In this section, we'll learn how to convert between string and number types using SQL Conversion Functions.
CAST() and CONVERT() functionsThese functions can be used to convert a string to a number and vice versa.
-- Example 1: Converting String to Integer
CAST('42' AS INTEGER) AS string_to_int;
-- Result: 42
-- Example 2: Converting Integer to String
CAST(42 AS CHAR) AS int_to_string;
-- Result: '42'š Note: Be cautious when converting strings to numbers, as an error may occur if the string is not a valid number.
LPAD() and RPAD() functionsThese functions are used to add leading or trailing characters to a string to ensure it reaches a specific length.
-- Example 1: Adding leading zeros to a number
LPAD(3, 5, '0') AS lpad_example;
-- Result: '00003'
-- Example 2: Adding trailing zeros to a number
RPAD(7, 5, '0') AS rpad_example;
-- Result: '0007'Now that you've learned about SQL Conversion Functions, it's time to put your knowledge to the test!
Which function is used to convert a string to a number in SQL?
What does the DATE_FORMAT() function do in SQL?
Keep practicing, and you'll soon be a SQL Conversion Functions master! š