What is diff between bulk collect and forall

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What is diff between bulk collect and forall..

Answer / prabu t

Bulk collect:
*is a CLAUSE
*is used to fetch the records from the cursor.
Forall:
*is a STATEMENT
*is used to do dml operation of fetched records.

*The body of the FORALL statement is a single DML statement
-- an INSERT, UPDATE, or DELETE.

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What is diff between bulk collect and forall..

Answer / prabhudatta barick

#"The keywords BULK COLLECT tell the SQL engine to bulk-bind output collections before returning them to the PL/SQL engine.
#You can use these keywords in the SELECT INTO, FETCH INTO, and RETURNING INTO clauses. Here is the syntax:

... BULK COLLECT INTO collection_name[, collection_name] ..."

#"The keyword FORALL instructs the PL/SQL engine to bulk-bind input collections before sending them to the SQL engine.
Although the FORALL statement contains an iteration scheme, it is not a FOR loop. Its syntax follows:

FORALL index IN lower_bound..upper_bound
sql_statement;

The index can be referenced only within the FORALL statement and only as a collection subscript.
The SQL statement must be an INSERT, UPDATE, or DELETE statement that references collection elements. And, the bounds must specify a valid range of consecutive index numbers.
The SQL engine executes the SQL statement once for each index number in the range."

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What is diff between bulk collect and forall..

Answer / shweta singh

BULK COLLECT: SELECT statements that retrieve multiple rows with a single fetch, improving the speed of data retrieval

FORALL: INSERTs, UPDATEs, and DELETEs that use collections to change multiple rows of data very quickly.

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