跳到主要内容

LEFT

Returns the leftmost len characters from the string str, or NULL if any argument is NULL. If len is greater than the length of str, the entire str is returned.

Syntax

LEFT(<str>, <len>);

Arguments

ArgumentsDescription
<str>The main string from where the character to be extracted
<len>The count of characters

Return Type

VARCHAR

Examples

SELECT LEFT('foobarbar', 5), LEFT('foobarbar', 10);

┌──────────────────────────────────────────────┐
left('foobarbar', 5)left('foobarbar', 10)
├──────────────────────┼───────────────────────┤
│ fooba │ foobarbar │
└──────────────────────────────────────────────┘
开始使用 Databend Cloud
低成本
快速分析
多种数据源
弹性扩展
注册