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mysql: add union examples #2009

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mysql: add union examples #2009

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9 changes: 9 additions & 0 deletions mysql.md
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Expand Up @@ -40,6 +40,15 @@ SELECT ... FROM t1 LEFT JOIN t2 ON t1.id1 = t2.id2 WHERE condition;
SELECT ... FROM t1 JOIN (t2 JOIN t3 ON ...) ON ...
```

### Select - Union

```sql
SELECT a1, a2 FROM t1 UNION SELECT a1, a2 from t2;
SELECT a1, a2 FROM t1 WHERE condition UNION SELECT a1, a2 from t2;
SELECT a1, a2, default_value as a3 FROM t1 UNION SELECT a1, a2, a3 from t2;
SELECT a1 FROM t1 UNION ALL SELECT a1 from t2;
```

### Conditions

```sql
Expand Down