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The length of varchar storage in mysql

Sorry, English is not my native language... :( I wanted to understand how the actual length of varchar is stored in mysql.ibd file. So I decided to make a test like this: CREATETABLErecord_format_demo(c1VARCHAR(10),c2VARCHAR(10)NOTNULL, c3CHAR(10),c4VARCHAR(10))CHARSET=asciiROW_FORMAT=COMPACT;INSERT...

P粉455093123 2024-04-01 15:50:34

Add foreign keys to big data types such as varchar(2000) mysql tables

I have two tables "affiliate_stats" and "transaction", 'affiliate_stats' has column 'affiliate_sales' varchar(2000) (child table), and 'transaction' has column '_id' varchar(100) primary key (parent table) when I Add constraint fk_affili_ by changing table affiliate_stats when ad...

P粉378264633 2023-09-05 17:33:34

Should the length of varchar type in MySQL be a multiple of the field's encoding?

I once saw someone on stackoverflow saying that it is recommended that when the length of the varchar field cannot be estimated, it is best to set it to an integer multiple of the encoding. For example, if the utf8 encoding is three bytes, then setting it to 255 is more appropriate. Is there any adv...

習慣沉默 2017-05-18 10:49:34

Is there any difference in storage between MySQL, VARCHAR(1000) and TEXT (purpose: to store long strings)?

The actual phenomenon is expected to understand the difference between VARCHAR/TEXT when storing large strings. How to choose the type? Understanding TEXT, an intermediate virtual table {code...} will be generated. The expected phenomenon is to master the experience of data type selection (especiall...

PHP中文网 2017-05-18 10:56:22

Move a varchar column containing CSV format to another table

The database I created 15 years ago was poorly designed. I have a varchar column containing comma separated strings: '5,8,13'. The string does not contain spaces and trailing commas, but the number of values is variable. What I want to do is create a new table and move these values paired with t...

P粉478188786 2023-09-10 19:59:25