SQL nvl等价 - 没有if/case语句&isnull&coalesce

SQL中是否有任何nvl()等效函数？

或者在某些情况下足够接近以相同方式使用的东西？

select nvl (purge_date,"SODIUFOSDIUFSDOIFUDSF") from id_rec where id=36581;


(expression)

SODIUFOSDIUFSDOIFUDSF

1 row(s) retrieved.

select isnull (purge_date,"SODIUFOSDIUFSDOIFUDSF") from id_rec where id=36581;

  674: Routine (isnull) can not be resolved.
Error in line 1
Near character position 8

select coalesce (purge_date,"SODIUFOSDIUFSDOIFUDSF") from id_rec where id=36581;

  674: Routine (coalesce) can not be resolved.
Error in line 1
Near character position 8

select decode(purge_date, NULL, "01/01/2009", purge_date) from id_rec where id=74115;

  800: Corresponding types must be compatible in CASE expression.
Error in line 1
Near character position 57

BradC.. 5

ISNULL(单个替换)

要么

COALESCE(返回其参数中的第一个非空表达式.)

ISNULL(单个替换)

要么

COALESCE(返回其参数中的第一个非空表达式.)