我想知道的是,使用单个查询可以编写查询以查找没有记录和没有重复记录的查询 在这里,我知道下面没有记录是查询
StatMovingWindow <- ggproto("StatMovingWindow", Stat,
compute_group = function(data, scales, wSize, wStep, fun) {
moveWin(data, wSize = wSize, wStep = wStep, f = fun)
},
required_aes = c("x", "y")
)
stat_movingwindow <- function(mapping = NULL, data = NULL,
fun = function(d) quantile(d, probs = c(0.05, 0.50, 0.95), na.rm = TRUE),
wStep = 0.1, wSize = 1,
geom = "smooth", position = "identity", show.legend = NA, inherit.aes = TRUE,
...
){
layer(
stat = StatMovingWindow, data = data, mapping = mapping, geom = geom,
position = position, show.legend = show.legend, inherit.aes = inherit.aes,
params = list(wStep = wStep, wSize = wSize, fun = fun, ...)
)
}
ggplot(data = d) + aes(x = x, y = y) +
stat_movingwindow(wStep = 0.1, wSize = 1) +
geom_point() + scale_x_continuous(breaks = 1:10)
,没有重复的查询是
select count(*) from table
这里国家是表中的一列名称。但是当我尝试这样写时,我需要一个查询来显示表中记录的总数以及国家列中的重复记录。
select count(country) from table group by country having count(country)>1
但是我没有锻炼 我认为这是我写的最糟糕的查询,但是请原谅我..有人可以帮我找这个吗?
谢谢
答案 0 :(得分:1)
您可以使用subquery
:
SELECT COUNT(country) AS duplicate_country,
(SELECT COUNT(*) FROM table t1) AS Total_count
FROM table t
GROUP BY country
HAVING COUNT(country) > 1;
答案 1 :(得分:0)
如果您想复制一个国家/地区,可以使用
select country, count(*)
from table
group by country
having count(country)>1
答案 2 :(得分:0)
您可以在下面尝试-
SELECT COUNT(*) as total_counts,
(SELECT COUNT(country) FROM table tablename A GROUP BY country
HAVING COUNT(country) > 1) as duplicates
from tablename;
答案 3 :(得分:0)
如果您只想要数字,那么我认为您想要:
select count(*) as num_records,
count(*) - count(distinct country) as num_duplicates
from t;