LEN
函數(shù)在 Oracle 數(shù)據(jù)庫(kù)中用于計(jì)算字符串的長(zhǎng)度
以下是 LEN
函數(shù)在 Oracle 數(shù)據(jù)統(tǒng)計(jì)中的一些應(yīng)用示例:
SELECT employee_id, first_name, last_name, LEN(first_name) + LEN(last_name) AS full_name_length
FROM employees;
SELECT customer_id, phone_number
FROM customers
WHERE LEN(phone_number) > 10;
SELECT product_id, product_name
FROM products
ORDER BY LEN(product_name);
SELECT supplier_id, address
FROM suppliers
WHERE LEN(address) < 20;
需要注意的是,LEN
函數(shù)只能計(jì)算單字節(jié)字符的長(zhǎng)度。如果需要計(jì)算多字節(jié)字符(如中文、日文等)的長(zhǎng)度,可以使用 LENGTH
函數(shù),它會(huì)根據(jù)字符集來(lái)計(jì)算字符串的長(zhǎng)度。