What's the difference between database char and varchar?

What is the difference between database char and varchar? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

The difference between database char and varchar: 1, the length of char type is fixed, while the length of varchar type is variable; 2, the data length of each modification of char type is the same, which is more efficient, while the data length of varchar type is different, and the efficiency is lower.

The difference between database char and varchar:

1. Different lengths

1. Char type: the length of char type is fixed.

2. Varchar type: the length of the varchar type is variable.

Second, the efficiency is different

1. Char type: the data length of each modification of char type is the same, which makes it more efficient.

2. Varchar type: the data length of each modification of varchar type is different, so it is less efficient.

Third, different storage

1. Char type: the char type is stored in the initial expected string plus a byte of the length of the record string, which takes up a large amount of space.

2. Varchar type: when the varchar type is stored, it is the actual string plus a byte of the length of the record string, which takes up less space.

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