多选题Which four statements correctly describe functions that are available in SQL? （）AINSTR returns the numeric position of a named character.BNVL2 returns the first non-null expression in the expression list.CTRUNCATE rounds the column, expression, or value to n decimal places.DDECODE translates an expression after comparing it to each search value.ETRIM trims the heading of trailing characters (or both) from a character string.FNVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.GNULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
多选题
Which four statements correctly describe functions that are available in SQL? （）
A
INSTR returns the numeric position of a named character.
B
NVL2 returns the first non-null expression in the expression list.
C
TRUNCATE rounds the column, expression, or value to n decimal places.
D
DECODE translates an expression after comparing it to each search value.
E
TRIM trims the heading of trailing characters (or both) from a character string.
F
NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.
G
NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
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