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The Ops Compendium
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SQL

  1. 1.
    (very good) DDL, DQL, DML, DCL and TCL - by geek for geeks
    1. 1.
      DDL – Data Definition Language (create, drop, alter, truncate)
    2. 2.
      DQl – Data Query Language (select)
    3. 3.
      DML – Data Manipulation Language (update, insert, delete, lock)
    4. 4.
      DCL – Data Control Language (grant, revoke)
    5. 5.
      TCL - Transaction Control Language (commit, rollback, savepoint, set transaction)
  2. 2.
    ​Introduction, index, keys, joins, aliases etc., newer​
  3. 3.
    ​Sql cheat sheet​
  4. 4.
    ​Primary key​
  5. 5.
    ​Foreign key, a key constraint that is included in the primary key allowed values​
  6. 6.
    ​Index, i.e., book index for fast reading​
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