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docs: add lnnvl function documentation #311

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9 changes: 9 additions & 0 deletions CN/modules/ROOT/pages/7.8.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@
|compose
|decompose
|sys_context
|lnnvl
|====

== 内置函数说明
Expand Down Expand Up @@ -1150,4 +1151,12 @@ ivorysql=# select sys_context('USERENV','DB_NAME');
ivorysql
(1 row)

```
=== `lnnvl` 函数
功能：当条件为 FALSE 或 UNKNOWN（NULL）时返回 TRUE，条件为 TRUE 时返回 FALSE。通常用于 WHERE 子句中，以包含条件为假或为 NULL 的行。测试用例如下：

查询值不等于 10 或值为 NULL 的行：

```
select * from t where lnnvl(a = 10);
```
9 changes: 9 additions & 0 deletions EN/modules/ROOT/pages/7.8.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@
|compose
|decompose
|sys_context
|lnnvl
|====

== Built-in function descriptions
Expand Down Expand Up @@ -1149,3 +1150,11 @@ ivorysql=# select sys_context('USERENV','DB_NAME');
(1 row)

```
=== `lnnvl` function
function: return TRUE if the condition is FALSE or UNKNOWN (NULL), and FALSE if the condition is TRUE. It is commonly used in a WHERE clause to also include rows whose condition evaluates to NULL. The test cases are as follows:

Query the rows where the value is not equal to 10 or is NULL:

```
select * from t where lnnvl(a = 10);
```
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