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Top 10 Tags datastax versions naming convention zookeeper client class definition md5 microsoft sql server data structures exception handling error handling. Top 10 Keywords microsoft download center down windows installer 4 0 download wordpress address url site address url web address url definition wordpress address url db2 integer site address url wordpress mac os installation step by step pdf abbreviation for return not found. Storage size is the actual length of bytes of input data, not n bytes.
Here I would like to make a simple analysis of them, of course, if there is a wrong place I hope you can advise. CHAR is very convenient for storing fixed-length data.
The index on the CHAR field is very efficient. For example, if you define char 10 , it will take up 10 bytes of space no matter whether you store the data up to 10 bytes or not.
We know that among the characters, only one byte of English characters is enough to store, but there are many Chinese characters and two bytes of storage. When English and Chinese characters coexist, it is easy to cause confusion. The Unicode character set is to solve this incompatibility of character sets Caused by the problem, all its characters are represented by two bytes, that is, English characters are also represented by two bytes.
The length of nchar and nvarchar is between 1 and Compared with char and varchar, nchar and nvarchar can store up to characters, whether it is English or Chinese characters; while char and varchar can store up to English and Chinese characters. It can be seen that when using the nchar and nvarchar data types, it is more convenient to worry about whether the input characters are English or Chinese characters, but there is some loss in the number when storing English.
I only know between "char" and "varchar". Umair A. The n types have unicode support, where the non-n types don't. Martijn Martijn Text is deprecated. The N represents uni-code. Twice the space. Mike M. All data types are properly and nicely No, there is a good case for ANY of them. TomTom TomTom There is no good case for using text or ntext.
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