T-SQL常用字符串函数

2015/10/15 37099

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SELECT SUBSTRING('123456', 2, 3);       --'234'
SELECT LEFT('123456', 3);               --'123'
SELECT RIGHT('123456', 3);              --'456'
SELECT LEN('你好');						--2
SELECT DATALENGTH('你好');				--4		
SELECT CHARINDEX('23', '1234553');		--2
SELECT PATINDEX('%[0-9]%','abc123gh');	--4
SELECT REPLACE('1-1', '-', '.');		--'1.1'
SELECT REPLICATE('A', 4);				--'AAAA'
SELECT STUFF('ABC', 2, 0, 'abc');		--'AabcBC'
SELECT UPPER('AbCd');					--'ABCD'
SELECT LOWER('AbCd');					--'abcd'
SELECT RTRIM('  abcd  ');				--'  abcd'	
SELECT LTRIM('  abcd  ');				--'abcd  '