在Oracle數(shù)據(jù)庫(kù)中,可以使用LEN函數(shù)和SUBSTR函數(shù)來(lái)獲取字符串的長(zhǎng)度和截取子字符串。以下是使用這兩個(gè)函數(shù)的技巧:
SELECT LEN('Hello World') AS str_length FROM dual;
SELECT SUBSTR('Hello World', 1, 5) AS sub_str FROM dual;
SELECT LEN(SUBSTR('Hello World', 7)) AS sub_str_length FROM dual;
SELECT SUBSTR('Hello World', INSTR('Hello World', 'o') + 1) AS after_o FROM dual;
這些技巧可以幫助您在Oracle中更好地處理字符串操作。