Add

The add operator (+) adds two operands and returns the sum.

Note: A configuration parameter is available to control whether this operator allows precision/scale to exceed 38. See Decimal Digit Limitation on Functions, for details.

DECIMAL and NUMERIC Data Types

When the add operator is applied to operands that include DECIMAL or NUMERIC data types, the output data type, precision and scale might depend on the data type, precision and scale of the operands, as shown below.

Syntax

operand1 + operand2

Remarks

•

The order of the inputs (operands) has no effect on the output data type.

•

The outputs for DECIMAL and NUMERIC data types combined with other operands are shown in the table.

Inputs	Output
DECIMAL(p1,s1) + DECIMAL(p2,s2)	DECIMAL(p3,s3), with p3 the larger precision of the inputs plus 1, and s3 the larger scale of the inputs.
DECIMAL(p1,s1) + NUMERIC
NUMERIC + NUMERIC	NUMERIC
DECIMAL(p,s) + not-DECIMAL-or-NUMERIC	DECIMAL(p,s)
NUMERIC + not-DECIMAL-or-NUMERIC	NUMERIC

Example

DECIMAL(6,1) + NUMERIC(4,2) -> DECIMAL(7,2)

INTERVAL Type

INTERVAL can be added to DATE, TIME, TIMESTAMP or another INTERVAL.

Syntax

operand1 + operand2

Remarks

•

INTERVAL days, hours, minutes, or seconds can only be added to other INTERVAL days, hours, minutes, or seconds. INTERVAL years or months can only be added to other INTERVAL years or months. The two groups of units are not interchangeable.

•

When adding months, the TDV Server does not round down the day of the month, and it might throw an error if the day of the month is invalid for the specified month.

•

The order of the inputs (operands) has no effect on the output data type.

•

The outputs for INTERVAL added to various operands are shown in the table.

Inputs	Output
INTERVAL + INTERVAL	INTERVAL
INTERVAL + DATE DATE + INTERVAL	DATE. Only days, months, and years can be added to a DATE.
INTERVAL + TIME TIME + INTERVAL	TIME
INTERVAL + TIMESTAMP TIMESTAMP + INTERVAL	TIMESTAMP

Examples

DATE '1999-12-31' + INTERVAL '1' DAY = DATE '2000-01-01'

INTERVAL '1' MONTH + DATE '1999-12-31'= DATE '2000-01-31'

DATE '1989-03-15' + INTERVAL '1' YEAR = DATE '1990-03-15'

DATE '2000-01-31' + INTERVAL '1' MONTH = <Error: February only has 28 days>

INTERVAL '6000' SECOND(4) + INTERVAL '3000' DAY(4) = INTERVAL '3000 01:40:00' DAY(4) TO   SECOND

INTERVAL '6000' SECOND(4) + TIME '7:00:00' = TIME '08:40:00'

Mixed Data Types

The add operator can be applied to operands that have a wide variety of data types, including operands comparable or castable to data types that can accept arithmetic operators.

Syntax

operand1 + operand2

Remarks

The operand data types and resulting output data types are shown in the table.

Operand1 Type	Operand2 Type	Output Type
TINYINT SMALLINT INTEGER BIGINT	TINYINT SMALLINT INTEGER BIGINT STRING	INTEGER
TINYINT SMALLINT INTEGER BIGINT	FLOAT REAL	FLOAT
TINYINT SMALLINT INTEGER BIGINT	DECIMAL NUMERIC	DECIMAL
TINYINT SMALLINT INTEGER BIGINT STRING	DATE	DATE
TINYINT SMALLINT INTEGER BIGINT STRING	TIMESTAMP	TIMESTAMP
FLOAT REAL	TINYINT SMALLINT INTEGER BIGINT STRING	FLOAT
FLOAT REAL	FLOAT REAL
FLOAT REAL	DECIMAL NUMERIC	DECIMAL
FLOAT REAL	DATE	DATE
FLOAT REAL	TIMESTAMP	TIMESTAMP
DECIMAL NUMERIC	TINYINT SMALLINT INTEGER BIGINT	DECIMAL
DECIMAL NUMERIC	FLOAT REAL
DECIMAL NUMERIC	DECIMAL NUMERIC	FLOAT
DECIMAL NUMERIC	DATE	DATE
DECIMAL NUMERIC	TIMESTAMP	TIMESTAMP
DATE	INTERVAL	DATE
DATE	STRING	DATE
TIMESTAMP	INTERVAL	TIMESTAMP
TIMESTAMP	STRING	TIMESTAMP
STRING	STRING TINYINT SMALLINT INTEGER BIGINT NUMERIC FLOAT REAL DECIMAL DATE TIMESTAMP	DECIMAL INTEGER INTEGER INTEGER INTEGER DECIMAL FLOAT FLOAT DECIMAL DATE TIMESTAMP
NULL	TINYINT SMALLINT INTEGER BIGINT NUMERIC FLOAT REAL DECIMAL DATE TIMESTAMP NULL	NULL
TINYINT SMALLINT INTEGER BIGINT NUMERIC FLOAT REAL DECIMAL DATE TIMESTAMP STRING	NULL	NULL
INTERVAL	DATE INTERVAL TIME TIMESTAMP	DATE INTERVAL TIME TIMESTAMP