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fixed the given examples of nullable in zh doc

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rainbowsysu 2019-10-24 20:07:10 +08:00
parent 18a72fa91a
commit 08788e3443
1 changed files with 12 additions and 28 deletions
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40
docs/zh/data_types/nullable.md
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@ -19,37 +19,21 @@
## 用法示例
```sql
CREATE TABLE t_null(x Int8, y Nullable(Int8)) ENGINE TinyLog
```
:) CREATE TABLE t_null(x Int8, y Nullable(Int8)) ENGINE TinyLog
CREATE TABLE t_null
(
x Int8,
y Nullable(Int8)
)
ENGINE = TinyLog
Ok.
0 rows in set. Elapsed: 0.012 sec.
:) INSERT INTO t_null VALUES (1, NULL)
INSERT INTO t_null VALUES
Ok.
1 rows in set. Elapsed: 0.007 sec.
:) SELECT x + y FROM t_null
SELECT x + y
FROM t_null
```sql
INSERT INTO t_null VALUES (1, NULL), (2, 3)
```
```sql
SELECT x + y FROM t_null
```
```text
┌─plus(x, y)─┐
│ ᴺᵁᴸᴸ │
│ 5 │
└────────────┘
2 rows in set. Elapsed: 0.144 sec.
```
[来源文章](https://clickhouse.yandex/docs/en/data_types/nullable/) <!--hide-->