7.6.1. Assignment Statements

Used for

Assigning a value to a variable

Available in

PSQL

Syntax

varname = <value_expr>

PSQL uses the equivalence symbol (‘=’) as its assignment operator. The assignment statement assigns an SQL expression value on the right to the variable on the left of the operator. The expression can be any valid SQL expression: it may contain literals, internal variable names, arithmetic, logical and string operations, calls to internal functions or to external functions (UDFs).

Example using assignment statements

CREATE PROCEDURE MYPROC (
  a INTEGER,
  b INTEGER,
  name VARCHAR (30)
)
RETURNS (
  c INTEGER,
  str VARCHAR(100))
AS
BEGIN
  -- assigning a constant
  c = 0;
  str = '';
  SUSPEND;
  -- assigning expression values
  c = a + b;
  str = name || CAST(b AS VARCHAR(10));
  SUSPEND;
  -- assigning expression value
  -- built by a query
  c = (SELECT 1 FROM rdb$database);
  -- assigning a value from a context variable
  str = CURRENT_USER;
  SUSPEND;
END

See also

DECLARE VARIABLE