This is the index type: normal is a normal index, unique is a unique index (columns with a unique index will have unique constraints and cannot have duplicate values, otherwise the insertion or update will fail), full text is a full-text index, only for English Strings are valid, but are invalid for Chinese (this kind of index is generally not used). Under normal circumstances, select normal.
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Index type
Index type
This is the index type: normal is a normal index, unique is a unique index (columns with a unique index will have unique constraints and cannot have duplicate values, otherwise the insertion or update will fail), full text is a full-text index, only for English Strings are valid, but are invalid for Chinese (this kind of index is generally not used). Under normal circumstances, select normal.