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# Query Results

Cómo controlar la salida de los resultados de una query.

**Ordenar resultados — `ORDER BY`**

Ordena por la columna que especifiques. Por defecto es ascendente, pero puedes indicar `ASC` o `DESC`:

```sql
SELECT * FROM logins ORDER BY password;        -- ascendente (default)
SELECT * FROM logins ORDER BY password DESC;   -- descendente
```

También puedes ordenar por **varias columnas**, para tener un orden secundario cuando hay valores duplicados en la primera:

```sql
SELECT * FROM logins ORDER BY password DESC, id ASC;
```

**Limitar resultados — `LIMIT`**

Si la query devuelve muchos registros, limitas la cantidad:

```sql
SELECT * FROM logins LIMIT 2;      -- solo 2 registros
```

Con un **offset** (desplazamiento), indicas desde dónde empezar antes del número de registros:

```sql
SELECT * FROM logins LIMIT 1, 2;   -- empieza en el 2º registro, devuelve 2
```

⚠️ El offset cuenta desde **0**. Por eso `LIMIT 1, 2` empieza a incluir desde el segundo registro.

**Cláusula `WHERE`**

Filtra registros según una condición:

```sql
SELECT * FROM table_name WHERE <condicion>;
```

Ejemplos:

```sql
SELECT * FROM logins WHERE id > 1;              -- id mayor a 1
SELECT * FROM logins WHERE username = 'admin';  -- username exacto
```

⚠️ Los tipos string y date van entre comillas simples (`'`) o dobles (`"`); los números se usan directamente.

**Cláusula `LIKE`**

Selecciona registros que coinciden con un patrón, usando comodines:

* `%` → coincide con **cero o más** caracteres
* `_` → coincide con **exactamente un** caracter

```sql
SELECT * FROM logins WHERE username LIKE 'admin%';  -- empieza con "admin"
SELECT * FROM logins WHERE username LIKE '___';     -- exactamente 3 caracteres (ej. "tom
```


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