EXECUTE BLOCK [(<inparams>)]
     [RETURNS (<outparams>)]
AS
   [<declarations>]
BEGIN
   [<PSQL statements>]
END

<inparams>         ::=  <param_decl> = ? [, <inparams> ]
<outparams>        ::=  <param_decl>     [, <outparams>]
<param_decl>       ::=  paramname <type> [NOT NULL] [COLLATE collation]
<type>             ::=  datatype | [TYPE OF] domain | TYPE OF COLUMN rel.col

datatype ::=
    {SMALLINT | INTEGER | BIGINT}
  | {FLOAT | DOUBLE PRECISION}
  | {DATE | TIME | TIMESTAMP}
  | {DECIMAL | NUMERIC} [(precision [, scale])]
  | {CHAR | CHARACTER | CHARACTER VARYING | VARCHAR} [(size)]
    [CHARACTER SET charset]
  | {NCHAR | NATIONAL CHARACTER | NATIONAL CHAR} [VARYING] [(size)]
  | BLOB [SUB_TYPE {subtype_num | subtype_name}]
    [SEGMENT SIZE seglen] [CHARACTER SET charset]
  | BLOB [(seglen [, subtype_num])]

<declarations>     ::=  declare_item [declare_item ...]
declare_item ::=  declare_var; | declare_cursor
          

          
This example injects the numbers 0 through 127 and their
          corresponding ASCII characters into the table
          ASCIITABLE:
EXECUTE BLOCK
AS
declare i INT = 0;
BEGIN
  WHILE (i < 128) DO
  BEGIN
    INSERT INTO AsciiTable VALUES (:i, ascii_char(:i));
    i = i + 1;
  END
END
          

The next example calculates the geometric mean of two numbers and returns it to the user:

EXECUTE BLOCK (x DOUBLE PRECISION = ?, y DOUBLE PRECISION = ?)
RETURNS (gmean DOUBLE PRECISION)
AS
BEGIN
  gmean = SQRT(x*y);
  SUSPEND;
END
          

Because this block has input parameters, it has to be prepared first. Then the parameters can be set and the block executed. It depends on the client software how this must be done and even if it is possible at all—see the notes below.

Our last example takes two integer values, smallest and largest. For all the numbers in the range smallest .. largest, the block outputs the number itself, its square, its cube and its fourth power.

EXECUTE BLOCK (smallest INT = ?, largest INT = ?)
RETURNS (number INT, square BIGINT, cube BIGINT, fourth BIGINT)
AS
BEGIN
  number = smallest;
  WHILE (number <= largest) DO
  BEGIN
    square = number * number;
    cube   = number * square;
    fourth = number * cube;
    SUSPEND;
    number = number + 1;
  END
END
          

Again, it depends on the client software if and how you can set the parameter values.