The SQL standard allows you to use an inline view in a DELETE statement, see the pseudo form below – If a condition such as key-preserved table is not met then it will result in error, “ORA-01752: cannot delete from view without exactly one key-preserved table.” I would like to show you the caveat of [...]
Joins A join is a query that combines rows from two or more tables. Oracle performs a join whenever multiple tables appear in the FROM clause of the query. Below is a SQL join statement, legacy syntax and ANSI/ISO syntax (also referred as new join syntax, was first introduced in Oracle 9i release) in a [...]
One of my all time favorite analytical functions are the LAG (look back) and LEAD (look ahead) functions, which were first introduced in Oracle 8i. It provides access to more than one row of a table at the same time without a self join. Given a series of rows returned from a query and a [...]
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