99 lines
1.9 KiB
SQL
99 lines
1.9 KiB
SQL
select *
|
|
from customers
|
|
where email like '%@gmail.com';
|
|
select *
|
|
from customers
|
|
where email like '%@web.de';
|
|
select *
|
|
from customers
|
|
where email like '%@web.de'
|
|
or email like '%@gmail.com';
|
|
|
|
select distinct SUBSTRING_INDEX(email, '@', -1) as domain
|
|
from customers;
|
|
# Nicht im Kurs, aber aus Interesse ausprobiert ---> Selektiert alle verschiedenen E-Mail Domains
|
|
|
|
select *
|
|
from customers
|
|
where firstname like 'M%';
|
|
select *
|
|
from customers
|
|
where firstname like 'M_____';
|
|
|
|
select firstname, lastname, age
|
|
from customers
|
|
where age between 20 and 30;
|
|
|
|
select *
|
|
from customers
|
|
where age not between 20 and 30;
|
|
|
|
select *
|
|
from customers
|
|
where firstname in ('Gitta', 'Dana', 'Anne');
|
|
|
|
select count(*)
|
|
from customers
|
|
where age not between 20 and 30; # 160
|
|
|
|
select count(distinct baby_names.name)
|
|
from baby_names
|
|
where name like 'Alex%'; # 20
|
|
select distinct baby_names.name
|
|
from baby_names
|
|
where name like 'Alex%';
|
|
|
|
select distinct baby_names.name
|
|
from baby_names
|
|
where name like '%m%';
|
|
select count(distinct baby_names.name)
|
|
from baby_names
|
|
where name like '%m%'; # 1183
|
|
|
|
select *
|
|
from baby_names
|
|
where year between 1900 and 1999;
|
|
select count(*)
|
|
from baby_names
|
|
where year between 1900 and 1999; # 161668
|
|
select count(*)
|
|
from baby_names
|
|
where year >= 1900
|
|
and year <= 1999; # 161668
|
|
|
|
select *
|
|
from baby_names
|
|
where year = 1900
|
|
or year = 1910
|
|
or year = 1920
|
|
or year = 1930
|
|
or year = 1940
|
|
or year = 1950
|
|
or year = 1960
|
|
or year = 1970
|
|
or year = 1980
|
|
or year = 1990;
|
|
select count(*)
|
|
from baby_names
|
|
where year = 1900
|
|
or year = 1910
|
|
or year = 1920
|
|
or year = 1930
|
|
or year = 1940
|
|
or year = 1950
|
|
or year = 1960
|
|
or year = 1970
|
|
or year = 1980
|
|
or year = 1990; # 15307
|
|
select count(*)
|
|
from baby_names
|
|
where year in (1900, 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1980, 1990); # 15307
|
|
|
|
select count(*)
|
|
from baby_names
|
|
where year like '19%0'; # 15307
|
|
|
|
select count(*)
|
|
from baby_names
|
|
where year % 10 = 0
|
|
and year between 1900 and 1999; # 15307 |