/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 vote229 views1 answer
Sub blocks in sql
SQL
0 vote223 views1 answer
Pl/sql loop example
SQL
6 votes245 views2 answers
Postgresql pg_dump
SQL
7 votes235 views6 answers
Reset identity column in sql server
SQL
-1 vote268 views2 answers
Sql search all tables for attributes
SQL
0 vote235 views1 answer
Mysql check datetime equals date
SQL
0 vote245 views1 answer
Running percentage of total postgres
SQL
0 vote326 views1 answer
1422: Explicit or implicit commit is not allowed in stored function or trigger
SQL
0 vote269 views1 answer
Sql pivot without aggregate
SQL
0 vote251 views2 answers
Mysql set foreign_key_checks=0
SQL