[sql] Strings as Primary Keys in SQL Database

Two reasons to use integers for PK columns:

  1. We can set identity for integer field which incremented automatically.

  2. When we create PKs, the db creates an index (Cluster or Non Cluster) which sorts the data before it's stored in the table. By using an identity on a PK, the optimizer need not check the sort order before saving a record. This improves performance on big tables.

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