/SQL/Sql select from multiple tables without join

Sql select from multiple tables without join

Join multiple tables sql

SELECT TableA.*, TableB.*, TableC.*, TableD.*
FROM TableA
    JOIN TableB
        ON TableB.aID = TableA.aID
    JOIN TableC
        ON TableC.cID = TableB.cID
    JOIN TableD
        ON TableD.dID = TableA.dID
WHERE DATE(TableC.date)=date(now())

Source: stackoverflow.com

Sql select from multiple tables without join

-- UNION: distinct values (slower)
SELECT emp_name AS name from employees
UNION       
SELECT cust_name AS name from customers;

-- UNION ALL: keeps duplicates (faster)
SELECT emp_name AS name from employees
UNION ALL      
SELECT cust_name AS name from customers;

Join multiple tables in sql

SELECT Books_Namn, Author_Namn, Author_Age, Store_Namn FROM books

JOIN Author ON Author_Id = Author_Author_Id

JOIN Books_has_Store ON Books_Books_Id = Books_Id

JOIN Store ON Store_Id = Store_Store_Id;

Similar codes

0 vote320 views1 answer
Get relation data in mysql using query to excel
SQL
0 vote307 views1 answer
Django mysqlclient connection string
SQL
0 vote317 views1 answer
Casterar postgres
SQL
1 vote303 views1 answer
Autocommit mysql
SQL
8 votes283 views1 answer
Similarities between ddl and dml
SQL
1 vote352 views1 answer
Connect to mysql database ubuntu
SQL
0 vote371 views1 answer
Sql cursor example multiple columns
SQL
0 vote328 views1 answer
Mysql type for large numbers with many decimal
SQL
0 vote327 views1 answer
Create table with float datatype in sql server
SQL
0 vote391 views1 answer
ALV GRID events
SQL