Update README.md

2026-04-30 22:13:56 +07:00 · 2021-07-28 17:38:42 +05:30
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@@ -471,3 +471,10 @@ Following are some of the most commonly used constraints available in SQL −
 - The UNIQUE operator searches every row of a specified table for uniqueness (no duplicates).
 # SQL - Expressions ✍
 - SQL EXPRESSIONs are like formulae and they are written in query language. You can also use them to query the database for a specific set of data.
      SELECT column1, column2, columnN 
      FROM table_name 
      WHERE [CONDITION|EXPRESSION];