How To Convert Character Strings to Numeric Values

Q

How To Convert Character Strings to Numeric Values? - MySQL FAQs - Introduction to SQL Basics

✍: FYIcenter.com

A

You can convert character strings to numeric values by using the CAST(string AS DECIMAL) or CAST(string AS SIGNED INTEGER) function as shown in the following examples:

SELECT CAST('4123.45700' AS DECIMAL) FROM DUAL;
   4123.46
   -- Very poor conversion

SELECT CAST('4.12345700e+3' AS DECIMAL) FROM DUAL;
   4123.46
   -- Very poor conversion

SELECT CAST('4123.45700' AS SIGNED INTEGER) FROM DUAL;
   4123

SELECT CAST('4.12345700e+3' AS SIGNED INTEGER) FROM DUAL;
   4
   -- Very poor conversion

2007-05-11, 4997👍, 0💬

How To Enter Boolean Values in SQL Statements
How To Enter Boolean Values in SQL Statements? - MySQL FAQs - Introduction to SQL Basics If you want to enter Boolean values in SQL statements, you use (TRUE), (FALSE), (true), or (false). Here are some good examples: SELECT TRUE, true, FALSE, false FROM DUAL; +------+------+-------+------- +| TRUE ... 2007-05-11, 9368👍, 0💬

How To Convert Numeric Values to Character Strings
How To Convert Numeric Values to Character Strings? - MySQL FAQs - Introduction to SQL Basics You can convert numeric values to character strings by using the CAST(value AS CHAR) function as shown in the following examples: SELECT CAST(4123.45700 AS CHAR) FROM DUAL; 4123.45700 -- How to get rid of t... 2007-05-11, 5557👍, 0💬

What Happens If NULL Values Are Involved in Expressions
What Happens If NULL Values Are Involved in Expressions? - MySQL FAQs - Introduction to SQL Basics If NULL values are used in expressions, the resulting values will be NULL values. In other words: Arithmetic expressions with NULL values result NULL values. Comparison expressions with NULL values res... 2007-05-11, 5228👍, 0💬

What Are NULL Values
What Are NULL Values? - MySQL FAQs - Introduction to SQL Basics NULL is a special value that represents no value. Here are basic rules about NULL values: NULL presents no value. NULL is not the same as an empty string ''. NULL is not the same as a zero value 0. NULL can be used as any data type. NUL... 2007-05-11, 5194👍, 0💬

How To Use Regular Expression in Pattern Match Conditions
How To Use Regular Expression in Pattern Match Conditions? - MySQL FAQs - Introduction to SQL Basics If you have a pattern that is too complex for LIKE to handle, you can use the regular expression pattern condition: REGEXP. The following tutorial exercise provides you some good examples: SELECT 'FY... 2007-05-11, 5150👍, 0💬

How To Convert Character Strings to Numeric Values
How To Convert Character Strings to Numeric Values? - MySQL FAQs - Introduction to SQL Basics You can convert character strings to numeric values by using the CAST(string AS DECIMAL) or CAST(string AS SIGNED INTEGER) function as shown in the following examples: SELECT CAST('4123.45700' AS DECIMAL) F... 2007-05-11, 4998👍, 0💬

How To Use CASE Expression
How To Use CASE Expression? - MySQL FAQs - Introduction to SQL Basics There are 2 ways to use the CASE expression. The first way is to return one of the predefined values based on the comparison of a given value to a list of target values. The second way is to return one of the predefined values bas... 2007-05-11, 4977👍, 0💬

What Are DDL Statements
What Are DDL Statements? - MySQL FAQs - Understanding SQL CREATE, ALTER and DROP Statements DDL (Data Definition Language) statements are statements to create and manage data objects in the database. The are 3 primary DDL statements: CREATE - Creating a new database object. ALTER - Altering the defi... 2007-05-11, 4946👍, 0💬

How To Use LIKE Conditions
How To Use LIKE Conditions? - MySQL FAQs - Introduction to SQL Basics A LIKE condition is also called pattern patch. There are 3 main rules on using LIKE condition: '_' is used in the pattern to match any one character. '%' is used in the pattern to match any zero or more characters. ESCAPE clause i... 2007-05-11, 4908👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.