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Trino 435 Documentation BEGIN

BEGIN#

Synopsis#

BEGIN
  [ DECLARE ... ]
  statements
END

Description#

Marks the start and end of a block in a SQL routine. BEGIN can be used wherever a statement can be used to group multiple statements together and to declare variables local to the block. A typical use case is as first statement within a FUNCTION. Blocks can also be nested.

After the BEGIN keyword, you can add variable declarations using DECLARE statements, followed by one or more statements that define the main body of the routine, separated by ;. The following statements can be used:

CASE
IF
ITERATE
LEAVE
LOOP
REPEAT
RETURN
SET
WHILE
Nested BEGIN blocks

Examples#

The following example computes the value 42:

FUNCTION meaning_of_life()
  RETURNS tinyint
  BEGIN
    DECLARE a tinyint DEFAULT 6;
    DECLARE b tinyint DEFAULT 7;
    RETURN a * b;
  END

Further examples of varying complexity that cover usage of the BEGIN statement in combination with other statements are available in the SQL routines examples documentation.

See also#