“Operador sindical SQL” Código de respuesta

sindicato SQL

-- 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;
VasteMonde

Operador sindical SQL

SELECT column_name(s) FROM table1
UNION
SELECT column_name(s) FROM table2;
naly moslih

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