在Postgresql中寻找解决方案
declare n_rows integer := select count(*) from sample;
SELECT generate_series AS serial_num
FROM generate_series(0, n_rows + 1)
SQL没有变量，因此除了使用函数外，还可以使用公用表表达式：
with var as (
select count(*) as n_rows
from sample
)
SELECT g.serial_num
FROM var, generate_series(0, n_rows + 1) as g(serial_num)
要不就：
SELECT *
FROM generate_series(0, (select count(*) + 1 from sample)) as g(serial_num)
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