Number of characters: Difference between revisions
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* [https://dev.mysql.com/doc/refman/8.0/en/char.html MySQL :: MySQL 8.0 Reference Manual :: 11.4.1 The CHAR and VARCHAR Types] e.g. {{kbd | key=<nowiki>VARCHAR(5)</nowiki>}} or {{kbd | key=<nowiki>CHAR(5)</nowiki>}} means can hold up to 5 characters. | * [https://dev.mysql.com/doc/refman/8.0/en/char.html MySQL :: MySQL 8.0 Reference Manual :: 11.4.1 The CHAR and VARCHAR Types] e.g. {{kbd | key=<nowiki>VARCHAR(5)</nowiki>}} or {{kbd | key=<nowiki>CHAR(5)</nowiki>}} means can hold up to 5 characters. | ||
== SQLite == | |||
[https://www.sqlitetutorial.net/sqlite-functions/sqlite-length/#targetText=SQLite%20Length,returns%20the%20number%20of%20bytes. Length] function | |||
<PRE> | |||
SELECT LENGTH("狐"); /* return 1 */ | |||
SELECT LENGTH("《王大文 Dawen》"); /* return 11 */ | |||
</PRE> | |||
== Excel == | == Excel == | ||
Revision as of 18:08, 28 October 2019
| String example | Number of characters | Number of bytes |
|---|---|---|
| fox | 3 | 3 |
| The quick brown fox jumps over the lazy dog | 43 | 43 |
| 狐 | 1 | 3 |
| 象 | 1 | 3 |
| 🐘 | 1 | 4 |
| 敏捷的棕毛狐狸從懶狗身上躍過 | 14 | 28 |
PHP
- PHP: strlen & PHP mb_strlen function
// number of characters
echo mb_strlen("狐", 'UTF-8') . PHP_EOL; // return 1
echo mb_strlen("《王大文 Dawen》", 'UTF-8') . PHP_EOL; // return 11
// string length (number of bytes)
echo strlen("狐") . PHP_EOL; // return 3
echo strlen("《王大文 Dawen》") . PHP_EOL; // return 21
MySQL
- MySQL: MySQL CHAR_LENGTH() function
// number of characters
SELECT CHAR_LENGTH("狐"); /* return 1 */
SELECT CHAR_LENGTH("《王大文 Dawen》"); /* return 11 */
// number of bytes
SELECT LENGTH("狐"); /* return 3 */
SELECT LENGTH("《王大文 Dawen》"); /* return 21 */
- MySQL :: MySQL 8.0 Reference Manual :: 11.4.1 The CHAR and VARCHAR Types e.g. VARCHAR(5) or CHAR(5) means can hold up to 5 characters.
SQLite
Length function
SELECT LENGTH("狐"); /* return 1 */
SELECT LENGTH("《王大文 Dawen》"); /* return 11 */
Excel
- Excel: LEN, LENB functions / LEN、LENB 函數
Result of the function LENB is not the same with the result in other programming language.
// number of characters
=LEN("狐") // return 1
=LEN("《王大文 Dawen》") // return 11
// number of bytes
=LENB("狐") // return 2
=LENB("《王大文 Dawen》") // return 16