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MySQL Tutorial - Converting Character Strings to Numeric Values

By: FYIcenter.com

(Continued from previous topic...)

How To Convert Character Strings to Numeric Values?

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

(Continued on next topic...)

  1. What Is SQL Standard?
  2. How Many Groups of Data Types?
  3. What Are Character String Data Types?
  4. What Are the Differences between CHAR and NCHAR?
  5. What Are the Differences between CHAR and VARCHAR?
  6. What Are the Differences between BINARY and VARBINARY?
  7. What Are Numeric Data Types?
  8. What Are Date and Time Data Types?
  9. How To Calculate Expressions with SELECT Statements?
  10. How To Include Comments in SQL Statements?
  11. How To Include Character Strings in SQL statements?
  12. How To Escape Special Characters in SQL statements?
  13. How To Concatenate Two Character Strings?
  14. How To Include Numeric Values in SQL statements?
  15. How To Enter Characters as HEX Numbers?
  16. How To Enter Numeric Values as HEX Numbers?
  17. How To Enter Binary Numbers in SQL Statements?
  18. How To Enter Boolean Values in SQL Statements?
  19. What Are NULL Values?
  20. What Happens If NULL Values Are Involved in Expressions?
  21. How To Convert Numeric Values to Character Strings?
  22. How To Convert Character Strings to Numeric Values?
  23. How To Use IN Conditions?
  24. How To Use LIKE Conditions?
  25. How To Use Regular Expression in Pattern Match Conditions?
  26. How To Use CASE Expression?

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