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doris/docs
morrySnow 699159698e [enhancement](planner) support update from syntax (#17639)
support update from syntax

note: enable_concurrent_update is not supported now

```
UPDATE <target_table>
  SET <col_name> = <value> [ , <col_name> = <value> , ... ]
  [ FROM <additional_tables> ]
  [ WHERE <condition> ]
```

for example:
t1
```
+----+----+----+-----+------------+
| id | c1 | c2 | c3  | c4         |
+----+----+----+-----+------------+
| 3  | 3  | 3  | 3.0 | 2000-01-03 |
| 2  | 2  | 2  | 2.0 | 2000-01-02 |
| 1  | 1  | 1  | 1.0 | 2000-01-01 |
+----+----+----+-----+------------+
```

t2
```
+----+----+----+------+------------+
| id | c1 | c2 | c3   | c4         |
+----+----+----+------+------------+
| 4  | 4  | 4  |  4.0 | 2000-01-04 |
| 2  | 20 | 20 | 20.0 | 2000-01-20 |
| 5  | 5  | 5  |  5.0 | 2000-01-05 |
| 1  | 10 | 10 | 10.0 | 2000-01-10 |
| 3  | 30 | 30 | 30.0 | 2000-01-30 |
+----+----+----+------+------------+
```

t3
```
+----+
| id |
+----+
| 1  |
| 5  |
| 4  |
+----+
```

do update
```sql
 update t1 set t1.c1 = t2.c1, t1.c3 = t2.c3 * 100 from t2 inner join t3 on t2.id = t3.id where t1.id = t2.id;
```

the result
```
+----+----+----+--------+------------+
| id | c1 | c2 | c3     | c4         |
+----+----+----+--------+------------+
| 3  | 3  | 3  |    3.0 | 2000-01-03 |
| 2  | 2  | 2  |    2.0 | 2000-01-02 |
| 1  | 10 | 1  | 1000.0 | 2000-01-01 |
+----+----+----+--------+------------+
```
2023-03-14 19:26:30 +08:00
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