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@ -250,7 +250,7 @@ SELECT actor_id FROM sakila.actor WHERE actor_id + 1 = 5;
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```sql
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```sql
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SELECT film_id, actor_ id FROM sakila.film_actor
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SELECT film_id, actor_ id FROM sakila.film_actor
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WhERE actor_id = 1 AND film_id = 1;
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WHERE actor_id = 1 AND film_id = 1;
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```
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```
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### 3. 索引列的顺序
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### 3. 索引列的顺序
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