似乎表中没有主键。 请勿将字段名称用作类型名称,如“DATE”。
无论如何,这里是一个例子如何做到你想要的,没有声称它是最好的。
请注意,如果有很多记录,此过程将会很慢,因此请确保放置了正确的索引。
SET TERM^;
create or alter procedure TEMP_TEST_PROC (
IDATE date)
returns (
OID varchar(4),
DATE_BEFORE date,
DATE_AFTER date,
CLOSEST_DATE date,
OTEXT varchar(32))
as
begin
for select distinct id from test_table_wo_pk
into :oid
do
begin
date_before = null;
date_after = null;
/* get closest past date*/
select first 1 t."DATE" from test_table_wo_pk t
where ((t."DATE" <= :idate) and (t.id = :oid))
order by t."DATE" desc
into
:date_before;
/* get closest future date*/
select first 1 t."DATE" from test_table_wo_pk t
where (t."DATE" >= :idate) and (t.id = :oid)
order by t."DATE"
into
:date_after;
/* bonus - get closest future or past date */
... You may check date_before, date_after for NULL here, and set closest_date value here....
if ((datediff(day,:date_before,:idate)) < (datediff(day,:idate,date_after))) then
closest_date = :date_before;
else
closest_date = :date_after;
/* set text column */
if (:date_after is not null) then
otext = :date_after;
else
otext = 'replased text';
suspend;
end
end^
SET TERM ;^
其结果是:
SO不是me'的服务的“代码。你有什么尝试,你卡在哪里? –