SQL LEN() 語法
SELECT LEN(column_name) FROM table_name
| Id | LastName | FirstName | Address | City |
|---|---|---|---|---|
| 1 | Adams | John | Oxford Street | London |
| 2 | Bush | George | Fifth Avenue | New York |
| 3 | Carter | Thomas | Changan Street | Beijing |
現在，我們希望取得 "City" 列中值的長度。
我們使用如下 SQL 語句：
SELECT LEN(City) as LengthOfCity FROM Persons
結果集類似這樣：
| LengthOfCity |
|---|
| 6 |
| 8 |
| 7 |