Built-in functions

Aggregate Functions

Aggregate functions compute a single result value from a set of input values. (Redshift SQL Language Reference Aggregate Functions).

Redshift	Snowflake
ANY_VALUE ( [ DISTINCT | ALL ] expression )	ANY_VALUE ( [ DISTINCT ]expression ) Notes: Snowflake supports the grammar, though ALL is disallowed. DISTINCT has no effect in either.
AVG ( [ DISTINCT | ALL ] expression )	AVG ( [ DISTINCT ] expression) Notes: Redshift and Snowflake may show different precision/decimals due to data type rounding/formatting.
COUNT	COUNT
LISTAGG	LISTAGG Notes: Redshift's DISTINCT ignores trailing spaces ('a ' = 'a'); Snowflake's does not. (See SSC-FDM-PG0013).
MAX	MAX
MEDIAN	MEDIAN Notes: Snowflake does not allow the use of date types, while Redshift does. (See SSC-FDM-PG0013).
MIN	MIN
PERCENTILE_CONT	PERCENTILE_CONT
STDDEV/STDDEV_SAMP ( [ DISTINCT | ALL ] expression) STDDEV_POP ( [ DISTINCT | ALL ] expression)	STDDEV/STDDEV_SAMP ( [ DISTINCT ] expression) STDDEV_POP ( [ DISTINCT ] expression) Notes: Snowflake supports all the grammar, though ALL is disallowed.
SUM	SUM
VARIANCE/VAR_SAMP ( [ DISTINCT | ALL ] expression) VAR_POP ( [ DISTINCT | ALL ] expression)	VARIANCE/VAR_SAMP ( [ DISTINCT ] expression) VAR_POP ( [ DISTINCT ] expression) Notes: Snowflake supports all the grammar, though ALL is disallowed.

Array Functions

Creates an array of the SUPER data type. (Redshift SQL Language Reference Array Functions).

Redshift	Snowflake
ARRAY ( [ expr1 ] [ , expr2 [ , ... ] ] )	ARRAY_CONSTRUCT ( [ <expr1> ] [ , <expr2> [ , ... ] ] )
ARRAY_CONCAT ( super_expr1, super_expr2 )	ARRAY_CAT ( <array1> , <array2> )
ARRAY_FLATTEN ( super_expr1,super_expr2,.. )	ARRAY_FLATTEN ( <array> ) Notes: the results may vary between platforms (See SSC-FDM-PG0013).
GET_ARRAY_LENGTH ( super_expr )	ARRAY_SIZE ( <array> | <variant>)
SPLIT_TO_ARRAY ( string,delimiter )	SPLIT (<string>, <separator>) Notes: Redshift allows missing delimiters; Snowflake requires them, defaulting to comma
SUBARRAY ( super_expr, start_position, length )	ARRAY_SLICE ( <array> , <from> , <to> ) Notes: Function names and the second argument differ; adjust arguments for equivalence.

Conditional expressions

Redshift	Snowflake
DECODE	DECODE Notes: the results may vary between platforms (See SSC-FDM-PG0013).
COALESCE ( expression, expression, ... )	COALESCE ( expression, expression, ... )
GREATEST ( value [, ...] )	GREATEST_IGNORE_NULLS ( <expr1> [, <expr2> ... ] )
LEAST ( value [, ...] )	LEAST_IGNORE_NULLS ( <expr1> [, <expr2> ... ])
NVL( expression, expression, ... )	NVL ( expression, expression ) Notes: Redshift's NVL accepts multiple arguments; Snowflake's NVL accepts only two. To match Redshift behavior, NVL with more than two arguments is converted to COALESCE.
NVL2	NVL2
NULLIF	NULLIF Notes: Redshift's NULLIF ignores trailing spaces in some string comparisons, unlike Snowflake. Therefore, the transformation adds RTRIM for equivalence.

Data type formatting functions

Data type formatting functions provide an easy way to convert values from one data type to another. For each of these functions, the first argument is always the value to be formatted and the second argument contains the template for the new format. (Redshift SQL Language Reference Data type formatting functions).

Redshift	Snowflake
TO_CHAR	TO_CHAR Notes: Snowflake's support for this function is partial (see SSC-EWI-PG0005).
TO_DATE	TO_DATE Notes: Snowflake's TO_DATE fails on invalid dates like '20010631' (June has 30 days), unlike Redshift's lenient TO_DATE. Use TRY_TO_DATE in Snowflake to handle these cases by returning NULL. (see SSC-FDM-RS0004, SSC-EWI-PG0005, SSC-FDM-0032).

Date and time functions

Redshift	Snowflake
ADD_MONTHS	ADD_MONTHS Notes: the results may vary between platforms (See SSC-FDM-PG0013).
AT TIME ZONE 'timezone'	CONVERT_TIMEZONE ( <source_tz> , <target_tz> , <source_timestamp_ntz> ) CONVERT_TIMEZONE ( <target_tz> , <source_timestamp> ) Notes: Redshift defaults to UTC; the Snowflake function requires explicit UTC specification. Therefore, it will be added as the target timezone.
CONVERT_TIMEZONE	CONVERT_TIMEZONE
CURRENT_DATE	CURRENT_DATE()
DATE	DATE
DATEADD/DATE_ADD ( datepart, interval, {date | time | timetz | timestamp} )	DATE_ADD ( <date_or_time_part>, <value>, <date_or_time_expr> ) Notes: Invalid date part formats are translated to Snowflake-compatible formats.
DATEDIFF/DATE_DIFF	DATEDIFF Notes: Invalid date part formats are translated to Snowflake-compatible formats.
DATE_PART/PGDATE_PART	DATE_PART Notes: this function is partially supported by Snowflake. (See SSC-EWI-PGOOO5).
DATE_PART_YEAR (date)	YEAR ( <date_or_timestamp_expr> ) Notes: the results may vary between platforms (See SSC-FDM-PG0013).
DATE_TRUNC	DATE_TRUNC Notes: Invalid date part formats are translated to Snowflake-compatible formats.
GETDATE()	GETDATE()
LAST_DAY	LAST_DAY Notes: the results may vary between platforms (See SSC-FDM-PG0013).
NEXT_DAY	NEXT_DAY Notes: the results may vary between platforms (See SSC-FDM-PG0013).
SYSDATE	SYSDATE()
TIMESTAMP	TO_TIMESTAMP
TRUNC	TRUNC

Redshift timestamps default to microsecond precision (6 digits); Snowflake defaults to nanosecond precision (9 digits). Adjust precision as needed using ALTER SESSION (e.g., ALTER SESSION SET TIMESTAMP_OUTPUT_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF2';). Precision loss may occur depending on the data type used.

Hash Functions

A hash function is a mathematical function that converts a numerical input value into another value. (Redshift SQL Language Reference Hash functions).

Redshift	Snowflake
FNV_HASH (value [, seed])	HASH ( <expr> [ , <expr> ... ] | *) Notes: In Redshift's FNV_HASH function, the seed parameter is optional, but it is not used in the Snowflake's Hash function since the seed parameter is only used on FNV algorithm.

JSON Functions

Redshift	Snowflake
JSON_EXTRACT_PATH_TEXT	JSON_EXTRACT_PATH_TEXT Notes: Redshift treats newline, tab, and carriage return characters literally; Snowflake interprets them. A JSON literal and dot-separated path are required to access nested objects in the Snowflake function. Paths with spaces in variables must be quoted.

Math functions

Redshift	Snowflake
ACOS	ACOS
ASIN	ASIN
ATAN	ATAN
ATAN2	ATAN2
CBRT	CBRT
CEIL/CEILING	CEIL
COS	COS
COT	COT
DEGREES	DEGREES
DEXP	EXP
DLOG1/LN	LN
DLOG10 (number)	LOG (10, number)
EXP	EXP
FLOOR	FLOOR
LOG	LOG
MOD	MOD
PI	PI
POWER/POW	POWER/POW
RADIANS	RADIANS
RANDOM	RANDOM
ROUND	ROUND
SIN	SIN
SIGN	SIGN
SQRT	SQRT
TAN	TAN
TRUNC	TRUNC

Redshift and Snowflake results may differ in scale.

String functions

String functions process and manipulate character strings or expressions that evaluate to character strings. (Redshift SQL Language Reference String functions).

Redshift	Snowflake
ASCII	ASCII
BTRIM	TRIM
CHAR_LENGTH	LENGTH
CHARACTER_LENGTH	LENGTH
CHARINDEX	CHARINDEX
CHR	CHR
CONCAT	CONCAT
INITCAP	INITCAP
LEFT/RIGHT	LEFT/RIGHT Notes: For negative lengths in LEFT/RIGHT, Snowflake returns an empty string; Redshift raises an error.
LEN	LEN
LOWER	LOWER
OCTET_LENGTH	OCTET_LENGTH Notes: the results may vary between platforms (See SSC-FDM-PG0013).
QUOTE_IDENT (string)	CONCAT ('"', string, '"')
REGEXP_REPLACE	REGEXP_REPLACE Notes: This function includes a parameters argument that enables the user to interpret the pattern using the Perl Compatible Regular Expression (PCRE) dialect, represented by the p value, this is removed to avoid any issues. (See SSC-EWI-0009, SC-FDM-0032, SSC-FDM- PG0011).
REPEAT	REPEAT
REPLACE	REPLACE
REPLICATE	REPEAT
REVERSE	REVERSE
SOUNDEX	SOUNDEX Notes: Certain special characters, the results may vary between platforms (See SSC-FDM-PG0013).
SPLIT_PART	SPLIT_PART Notes: Snowflake and Redshift handle SPLIT_PART differently with case-insensitive collations.
STRPOS (string, substring )	POSITION ( <expr1> IN <expr> )
SUBSTRING	SUBSTRING Notes: Snowflake partially supports this function. Redshift's SUBSTRING, with a non-positive start_position, calculates start_position + number_characters (returning '' if the result is non-positive). Snowflake's behavior differs. (See SSC-EWI-RS0006).
TEXTLEN	LENGTH
TRANSLATE	TRANSLATE
TRIM	TRIM Notes: Redshift uses keywords (BOTH, LEADING, TRAILING) for trim; Snowflake uses TRIM, LTRIM, RTRIM.
UPPER	UPPER

SUPER type information functions

Redshift	Snowflake
IS_ARRAY	IS_ARRAY Notes: the results may vary between platforms (See SSC-FDM-PG0013).
IS_BOOLEAN	IS_BOOLEAN Notes: the results may vary between platforms (See SSC-FDM-PG0013).

Window functions

Redshift	Snowflake
AVG	AVG Notes: AVG rounding/formatting can vary by data type between Redshift and Snowflake.
COUNT	COUNT
DENSE_RANK	DENSE_RANK Notes: ORDER BY is mandatory in Snowflake; missing clauses are replaced with ORDER BY 1.
FIRST_VALUE	FIRST_VALUE Notes: Snowflake needs ORDER BY; missing clauses get ORDER BY <expr>.
LAG	LAG
LAST_VALUE	LAST_VALUE Notes: Snowflake needs ORDER BY; missing clauses get ORDER BY <expr>.
LEAD	LEAD Notes: Redshift allows constant or expression offsets; Snowflake allows only constant offsets.
LISTAGG	LISTAGG Notes: Redshift's DISTINCT ignores trailing spaces ('a ' = 'a'); Snowflake's does not. (See SSC-FDM-PG0013).
MEDIAN	MEDIAN Notes: Snowflake does not allow the use of date types, while Redshift does. (See SSC-FDM-PG0013).
NTH_VALUE	NTH_VALUE Notes: ORDER BY is mandatory in Snowflake; missing clauses are replaced with ORDER BY 1.
NTILE	NTILE Notes: ORDER BY is mandatory in Snowflake; missing clauses are replaced with ORDER BY 1. (See SSC-FDM-PG0013).
PERCENT_RANK	PERCENT_RANK Notes: ORDER BY is mandatory in Snowflake; missing clauses are replaced with ORDER BY 1.
PERCENTILE_CONT	PERCENTILE_CONT Notes: Rounding varies between platforms.
PERCENTILE_DISC	PERCENTILE_DISC
RANK	RANK
RATIO_TO_REPORT	RATIO_TO_REPORT Notes: the results may vary between platforms (See SSC-FDM-PG0013).
ROW_NUMBER	ROW_NUMBER Notes: ORDER BY is mandatory in Snowflake; missing clauses are replaced with ORDER BY 1.
STDDEV_SAMP | STDDEV | STDDEV_POP ( [ ALL ] expression ) OVER ( [ PARTITION BY expr_list ] [ ORDER BY order_list frame_clause ] )	STDDEV/STDDEV_SAMP /STDDEV_POP ( [ DISTINCT ] expr1) OVER ( [ PARTITION BY expr2 ] [ ORDER BY expr3 [ ASC | DESC ] [ <window_frame> ] ] ) Notes: Snowflake supports all the grammar, though ALL is disallowed.
VAR_SAMP | VARIANCE | VAR_POP ( [ ALL ] expression ) OVER ( [ PARTITION BY expr_list ] [ ORDER BY order_list frame_clause ] )	VARIANCE/VAR_SAMP / VAR_POP ( [ DISTINCT ] expr1) OVER ( [ PARTITION BY expr2 ] [ ORDER BY expr3 [ ASC | DESC ] [ <window_frame> ] ] ) Notes: Snowflake supports all the grammar, though ALL is disallowed.

Known Issues

1. For more information about quoted identifiers in functions, click here.

Related EWIs

• SSC-EWI-PG0005: Date or time format is not supported in Snowflake.
• SSC-FDM-0032: Parameter is not a literal value, transformation could not be fully applied
• SSC-FDM-PG0013: Function syntactically supported by Snowflake but may have functional differences.
• SSC-FDM-RS0004: Invalid dates will cause errors in Snowflake.