SELECT * FROM products WHERE stock_count <= 10 ORDER BY stock_count ASC;
SELECT * FROM table_name;
-- Sorting col1 ASCending then col2 DESCending
SELECT col1, col2 FROM table_name ORDER BY col1 ASC, col2 DESC;
-- Filter on col1
SELECT col1, col2 FROM table_name WHERE col1 = 'a value';
-- Containing 'searched'
SELECT col1, col2 FROM table_name WHERE col1 LIKE '%searched%';
-- All different values
SELECT DISTINCT col1 FROM table_name;
-- Simple sum
SELECT col1, sum(col2) FROM table_name GROUP BY col1;
SELECT ime, prezime
FROM studenti
WHERE ime = 'Dejan';
Used to select data from a database, which is then returned in a results set.
Example 1: Selects all columns from all users.
SELECT * FROM users;
Example 2: Selects the first_name and surname columns
from all users.xx
SELECT first_name, surname FROM users;
Everything in brackets is optional.
SELECT [all/distinct] <COL1>, <COL2>, <COL3>
FROM <TABLE_NAME>
[JOIN <JOIN_CONDITION>]
[WHERE <CONDITION>]
[GROUP BY <COLUMN_NAME>]
[HAVING <SEARCH_CONDITION>]
[ORDER BY <SORT_SPECIFICATION>]
SELECT first_name, last_name
FROM Customers;
SELECT orders.order_id, customers.last_name
FROM orders
INNER JOIN customers
ON orders.customer_id = customers.customer_id
WHERE orders.order_id <> 1
ORDER BY orders.order_id;
SELECT column_name FROM table_name;
SELECT naslov, stranice
FROM knjige
WHERE stranice<300
Mit SELECT können Daten aus der Datenbank abgefragt werden. Es ist die am
meissten verbreitete Art.
SELECT name
FROM country
WHERE region = (
SELECT region
FROM country
WHERE name = 'Brasilien'
)
#sql select query
SELECT * FROM table_name;
-- Sorting col1 ASCending then col2 DESCending
SELECT col1, col2 FROM table_name ORDER BY col1 ASC, col2 DESC;
-- Filter on col1
SELECT col1, col2 FROM table_name WHERE col1 = 'a value';
-- Containing 'searched'
SELECT col1, col2 FROM table_name WHERE col1 LIKE '%searched%';
-- All different values
SELECT DISTINCT col1 FROM table_name;
-- Simple sum
SELECT col1, sum(col2) FROM table_name GROUP BY col1;
Projection = Select the columns in
a table that are returned by a query
Selection = Selects the rows in a
table that are returned by a query
Join = Brings together data that is
stored in different tables by
specifying the link between them