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Multitable inserts were introduced in Oracle 9i to allow a single INSERT INTO .. SELECT statement to conditionally, or unconditionally, insert into multiple tables. This statement reduces table scans and PL/SQL code necessary for performing multiple conditional inserts compared to previous versions. It's main use is for the ETL process in data warehouses where it can be parallelized and/or convert non-relational data into a relational format.

The Oracle documentation uses the term 'multitable inserts', but other resources hyphenate the name, so you will also see it written as 'multi-table inserts'.

Related articles.

Setup

Create and populate a test table to act as the source of the data for the basic examples, as well as three destination tables based on the source table, but with no rows.

Create and populate a test table to act as the source for the pivot example, and an empty destination table.

Unconditional INSERT ALL

When using an unconditional INSERT ALL statement, each row produced by the driving query results in a new row in each of the tables listed in the INTO clauses. In the example below, the driving query returns 10 rows, which means we will see 30 rows inserted, 10 in each table.

An unconditional INSERT ALL statement can be used to pivot or split data. In the following example we convert each single row representing a week of data into separate rows for each day.

Conditional INSERT ALL

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In a conditional INSERT ALL statement, conditions can be added to the INTO clauses, which means the total number of rows inserted may be less that the number of source rows multiplied by the number of INTO clauses. It looks similar to a CASE expression, but each condition is always tested based on the current row from the driving query.

Pro

In the following example we insert into into different tables depending on the range of the ID value.

Obiee Table Prompt Multi Select

A single condition can be used for multiple INTO clauses.

You can use a condition of '1=1' to force all rows into a table.

INSERT FIRST

Using INSERT FIRST makes the multitable insert work like a CASE expression, so the conditions are tested until the first match is found, and no further conditions are tested. We can also include an optional ELSE clause to catch any rows not already cause by a previous condition.

Restrictions

The restrictions on multitable insertss are as follows.

  • Multitable inserts can only be performed on tables, not on views or materialized views.
  • You cannot perform a multitable insert via a DB link.
  • You cannot perform multitable inserts into nested tables.
  • The sum of all the INTO columns cannot exceed 999.
  • Sequences cannot be used in the multitable insert statement. It is considered a single statement, so only one sequence value will be generated and used for all rows.
  • Multitable inserts can't be used with plan stability.
  • If the PARALLEL hint is used for any target tables, the whole statement will be parallelized. If not, the statement will only be parallelized if the tables have PARALLEL defined.
  • Multitable statements will not be parallelized if any of the tables are index-organized, or have bitmap indexes defined on them.

For more information see:

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Hope this helps. Regards Tim...