database design - MySQL - varchar length and performance
Sep 13, 2014 · Is declaring VARCHAR size make sense for performance? Is there any difference (in speed) between VARCHAR(50) and VARCHAR(255)? Or defining length is logic/design …
mysql - Length of varchar column - is there an advantage to using …
Jan 14, 2019 · In MySQL, there are reasons to stop at 191, 255, 767, 3071, 64K, and probably other values. Some depend on Engine, some on CHARACTER SET, etc. A VARCHAR is …
mysql - Can I stick with VARCHAR (255) instead of VARCHAR (191) …
Jan 17, 2024 · Sure, you can use a VARCHAR length up to 65535 bytes. When using utf8mb4, allow for up to 4 bytes per character, so the effective maximum length is 65535/4 characters, …
Performance implications of MySQL VARCHAR sizes
Aug 9, 2017 · Is there a performance difference in MySQL between varchar sizes? For example, varchar(25) and varchar(64000). If not, is there a reason not to declare all varchars with the …
What is the difference between MySQL VARCHAR and TEXT data …
After version 5.0.3 (which allowed VARCHAR to be 65,535 bytes and stopped truncating trailing spaces), is there any major difference between these two data types? I was reading the list of …
mysql - CHAR and VARCHAR lengths for multibyte characters
Sep 19, 2023 · A utf8mb4 character takes between 1 and 4 bytes. The 768 must be referring to utf8, not utf8mb4. CHAR and VARCHAR refer to characters.
How to set default value as empty string for all rows at once in …
Nov 12, 2020 · In MySQL, while creating a table, I'like to have empty string '' as value for all needed columns instead of 'NULL'. Is it possible, is it safe and how can I do to do that at once?
MySQL Storage: VARCHAR vs. TEXT - Database Administrators …
Oct 23, 2024 · Closed last year. I'm comparing the storage efficiency of VARCHAR and TEXT data types in MySQL 8, using the InnoDB storage engine and the default utf8mb4 character …
How to do a case sensitive search in WHERE clause?
Mar 19, 2012 · I want case sensitive search in SQL query. But by default, MySQL does not consider the case of the strings. Any idea on how to do a case sensitive search in SQL query?
Performance difference between Text and Varchar in Mysql
Nov 9, 2018 · I was experimenting with text and varchars in mysql 5.7. I create a simple mysql table as below CREATE TABLE small_table ( pk int(11) NOT NULL AUTO_INCREMENT, varc …