Data Manipulation Language (DML)
INSERT, UPDATE, and DELETE statements define the DML commands. All of these may use joins, subqueries, correlated subqueries, and in-line views. The in-line views must be contained within a subquery or correlated subquery. DML commands can insert, update, or delete one to many rows of data.
INSERT Statements
The INSERT statement acts on rows of data. Inserting data into tables can be done row by row, or by groups of rows. You have two potential ways to cause insertion anomalies when inserting data.
One type of insertion anomaly happens when you insert two rows with the same information. Primary key constraints typically reduce the likelihood that entire rows are duplicated, but it is possible to create repeating ...
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