/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 vote176 views1 answer
FIND ABOVE AVERAGE SALARY EARNER IN SQL
SQL
0 vote136 views1 answer
Calculate discount from original price sql
SQL
0 vote182 views1 answer
How to save data in database in mysql node
SQL
0 vote177 views1 answer
Mysql create table columns with spaces
SQL
0 vote342 views1 answer
Current month transactions in mysql
SQL
1 vote179 views1 answer
Postgresql define pk sequence next number
SQL
0 vote207 views1 answer
R rmysql connect local database Plugin caching_sha2_password could not be loaded
SQL
0 vote216 views1 answer
SQL SERVER xquery count child nodes
SQL
2 votes167 views1 answer
Sql alchemy or
SQL
12 votes178 views4 answers
Import mysql database command line linux
SQL