The following table summarizes the availability of functions in an Amazon Redshift database. Columns marked with an X indicate that the function can be pushed to the Amazon Redshift database by using source-side or full

SQL ELT optimization

. Columns marked with S indicate that the function can be pushed to the Amazon Redshift database only by using source-side

SQL ELT optimization

. Columns marked with a dash (-) symbol indicate that the function cannot be pushed to the database.

Function	SQL ELT optimization	Function	SQL ELT optimization	Function	SQL ELT optimization
ABORT()	-	INSTR()	X	REG_REPLACE	-
ABS()	X	IS_DATE()	-	REPLACECHR()	-
ADD_TO_DATE()	X	IS_NUMBER()	-	REPLACESTR()	-
AES_DECRYPT()	-	IS_SPACES()	-	REVERSE()	-
AES_ENCRYPT()	-	ISNULL()	S	ROUND(DATE)	-
ASCII()	-	LAST()	-	ROUND(NUMBER)	X
AVG()	S	LAST_DAY()	X	RPAD()	X
CEIL()	X	LEAST()	-	RTRIM()	X
CHOOSE()	-	LENGTH()	X	SET_DATE_PART()	-
CHRCODE()	-	LN()	X	SIGN()	X
COMPRESS()	-	LOG()	-	SIN()	X
CONCAT()	X	LOOKUP	-	SINH()	-
COS()	X	LOWER()	X	SOUNDEX()	-
COSH()	-	LPAD()	X	SQRT()	X
COUNT()	S	LTRIM()	X	STDDEV()	S
CRC32()	-	MAKE_DATE_TIME()	-	SUBSTR()	X
CUME()	-	MAX()	S	SUM()	S
DATE_COMPARE()	X	MD5()	X	SYSTIMESTAMP()	S
DATE_DIFF()	X	MEDIAN()	-	TAN()	S
DECODE()	X	METAPHONE()	-	TANH()	-
DECODE_BASE64()	-	MIN()	S	TO_BIGINT	X
DECOMPRESS()	-	MOD()	S	TO_CHAR(DATE)	S
ENCODE_BASE64()	-	MOVINGAVG()	-	TO_CHAR(NUMBER)	X
EXP()	X	MOVINGSUM()	-	TO_DATE()	X
FIRST()	-	NPER()	-	TO_DECIMAL()	X
FLOOR()	X	PERCENTILE()	-	TO_FLOAT()	X
FV()	-	PMT()	-	TO_INTEGER()	X
GET_DATE_PART()	X	POWER()	X	TRUNC(DATE)	S
GREATEST()	-	PV()	-	TRUNC(NUMBER)	S
IIF()	X	RAND()	-	UPPER()	X
IN()	S	RATE()	-	VARIANCE()	S
INDEXOF()	-	REG_EXTRACT()	-
INITCAP()	X	REG_MATCH()	-

The following table lists the operators that can be used in an Amazon Redshift database. Columns marked with an X indicate that the operator can be pushed to the Amazon Redshift database by using source-side, or full

SQL ELT optimization

.

Operator	SQL ELT optimization
+	X
-	X
*	X
/	X
%	X
||	X
>	X
=	X
>=	X
<=	X
!=	X
AND	X
OR	X
NOT	X
^=	X