我为模型的粗鲁性表示歉意，但这似乎可以进行正确的CRC32计算。我不是TSQL专家，我敢肯定，真正的SQL Server专业人士可以大大改善这一点。

@input是用于计算CRC32的变量。将其打包为sproc或udf应该是微不足道的，并且可以将查找表分解为永久表（甚至是即时计算）。

无论如何，它似乎有效。我很想看到任何改进，因为学习新技巧总是很不错的:)

编辑：我已经检查了我对http://crc32-checksum.waraxe.us/的结果，到目前为止看来还不错。

安德鲁

DECLARE @input VARCHAR(50)
SET @input = 'test'

SET NOCOUNT ON
DECLARE @tblLookup TABLE (ID INT IDENTITY(0,1) NOT NULL, Value BIGINT)
INSERT INTO @tblLookup VALUES (0)
INSERT INTO @tblLookup VALUES (1996959894)
INSERT INTO @tblLookup VALUES (3993919788)
INSERT INTO @tblLookup VALUES (2567524794)
INSERT INTO @tblLookup VALUES (124634137)
INSERT INTO @tblLookup VALUES (1886057615)
INSERT INTO @tblLookup VALUES (3915621685)
INSERT INTO @tblLookup VALUES (2657392035)
INSERT INTO @tblLookup VALUES (249268274)
INSERT INTO @tblLookup VALUES (2044508324)
INSERT INTO @tblLookup VALUES (3772115230)
INSERT INTO @tblLookup VALUES (2547177864)
INSERT INTO @tblLookup VALUES (162941995)
INSERT INTO @tblLookup VALUES (2125561021)
INSERT INTO @tblLookup VALUES (3887607047)
INSERT INTO @tblLookup VALUES (2428444049)
INSERT INTO @tblLookup VALUES (498536548)
INSERT INTO @tblLookup VALUES (1789927666)
INSERT INTO @tblLookup VALUES (4089016648)
INSERT INTO @tblLookup VALUES (2227061214)
INSERT INTO @tblLookup VALUES (450548861)
INSERT INTO @tblLookup VALUES (1843258603)
INSERT INTO @tblLookup VALUES (4107580753)
INSERT INTO @tblLookup VALUES (2211677639)
INSERT INTO @tblLookup VALUES (325883990)
INSERT INTO @tblLookup VALUES (1684777152)
INSERT INTO @tblLookup VALUES (4251122042)
INSERT INTO @tblLookup VALUES (2321926636)
INSERT INTO @tblLookup VALUES (335633487)
INSERT INTO @tblLookup VALUES (1661365465)
INSERT INTO @tblLookup VALUES (4195302755)
INSERT INTO @tblLookup VALUES (2366115317)
INSERT INTO @tblLookup VALUES (997073096)
INSERT INTO @tblLookup VALUES (1281953886)
INSERT INTO @tblLookup VALUES (3579855332)
INSERT INTO @tblLookup VALUES (2724688242)
INSERT INTO @tblLookup VALUES (1006888145)
INSERT INTO @tblLookup VALUES (1258607687)
INSERT INTO @tblLookup VALUES (3524101629)
INSERT INTO @tblLookup VALUES (2768942443)
INSERT INTO @tblLookup VALUES (901097722)
INSERT INTO @tblLookup VALUES (1119000684)
INSERT INTO @tblLookup VALUES (3686517206)
INSERT INTO @tblLookup VALUES (2898065728)
INSERT INTO @tblLookup VALUES (853044451)
INSERT INTO @tblLookup VALUES (1172266101)
INSERT INTO @tblLookup VALUES (3705015759)
INSERT INTO @tblLookup VALUES (2882616665)
INSERT INTO @tblLookup VALUES (651767980)
INSERT INTO @tblLookup VALUES (1373503546)
INSERT INTO @tblLookup VALUES (3369554304)
INSERT INTO @tblLookup VALUES (3218104598)
INSERT INTO @tblLookup VALUES (565507253)
INSERT INTO @tblLookup VALUES (1454621731)
INSERT INTO @tblLookup VALUES (3485111705)
INSERT INTO @tblLookup VALUES (3099436303)
INSERT INTO @tblLookup VALUES (671266974)
INSERT INTO @tblLookup VALUES (1594198024)
INSERT INTO @tblLookup VALUES (3322730930)
INSERT INTO @tblLookup VALUES (2970347812)
INSERT INTO @tblLookup VALUES (795835527)
INSERT INTO @tblLookup VALUES (1483230225)
INSERT INTO @tblLookup VALUES (3244367275)
INSERT INTO @tblLookup VALUES (3060149565)
INSERT INTO @tblLookup VALUES (1994146192)
INSERT INTO @tblLookup VALUES (31158534)
INSERT INTO @tblLookup VALUES (2563907772)
INSERT INTO @tblLookup VALUES (4023717930)
INSERT INTO @tblLookup VALUES (1907459465)
INSERT INTO @tblLookup VALUES (112637215)
INSERT INTO @tblLookup VALUES (2680153253)
INSERT INTO @tblLookup VALUES (3904427059)
INSERT INTO @tblLookup VALUES (2013776290)
INSERT INTO @tblLookup VALUES (251722036)
INSERT INTO @tblLookup VALUES (2517215374)
INSERT INTO @tblLookup VALUES (3775830040)
INSERT INTO @tblLookup VALUES (2137656763)
INSERT INTO @tblLookup VALUES (141376813)
INSERT INTO @tblLookup VALUES (2439277719)
INSERT INTO @tblLookup VALUES (3865271297)
INSERT INTO @tblLookup VALUES (1802195444)
INSERT INTO @tblLookup VALUES (476864866)
INSERT INTO @tblLookup VALUES (2238001368)
INSERT INTO @tblLookup VALUES (4066508878)
INSERT INTO @tblLookup VALUES (1812370925)
INSERT INTO @tblLookup VALUES (453092731)
INSERT INTO @tblLookup VALUES (2181625025)
INSERT INTO @tblLookup VALUES (4111451223)
INSERT INTO @tblLookup VALUES (1706088902)
INSERT INTO @tblLookup VALUES (314042704)
INSERT INTO @tblLookup VALUES (2344532202)
INSERT INTO @tblLookup VALUES (4240017532)
INSERT INTO @tblLookup VALUES (1658658271)
INSERT INTO @tblLookup VALUES (366619977)
INSERT INTO @tblLookup VALUES (2362670323)
INSERT INTO @tblLookup VALUES (4224994405)
INSERT INTO @tblLookup VALUES (1303535960)
INSERT INTO @tblLookup VALUES (984961486)
INSERT INTO @tblLookup VALUES (2747007092)
INSERT INTO @tblLookup VALUES (3569037538)
INSERT INTO @tblLookup VALUES (1256170817)
INSERT INTO @tblLookup VALUES (1037604311)
INSERT INTO @tblLookup VALUES (2765210733)
INSERT INTO @tblLookup VALUES (3554079995)
INSERT INTO @tblLookup VALUES (1131014506)
INSERT INTO @tblLookup VALUES (879679996)
INSERT INTO @tblLookup VALUES (2909243462)
INSERT INTO @tblLookup VALUES (3663771856)
INSERT INTO @tblLookup VALUES (1141124467)
INSERT INTO @tblLookup VALUES (855842277)
INSERT INTO @tblLookup VALUES (2852801631)
INSERT INTO @tblLookup VALUES (3708648649)
INSERT INTO @tblLookup VALUES (1342533948)
INSERT INTO @tblLookup VALUES (654459306)
INSERT INTO @tblLookup VALUES (3188396048)
INSERT INTO @tblLookup VALUES (3373015174)
INSERT INTO @tblLookup VALUES (1466479909)
INSERT INTO @tblLookup VALUES (544179635)
INSERT INTO @tblLookup VALUES (3110523913)
INSERT INTO @tblLookup VALUES (3462522015)
INSERT INTO @tblLookup VALUES (1591671054)
INSERT INTO @tblLookup VALUES (702138776)
INSERT INTO @tblLookup VALUES (2966460450)
INSERT INTO @tblLookup VALUES (3352799412)
INSERT INTO @tblLookup VALUES (1504918807)
INSERT INTO @tblLookup VALUES (783551873)
INSERT INTO @tblLookup VALUES (3082640443)
INSERT INTO @tblLookup VALUES (3233442989)
INSERT INTO @tblLookup VALUES (3988292384)
INSERT INTO @tblLookup VALUES (2596254646)
INSERT INTO @tblLookup VALUES (62317068)
INSERT INTO @tblLookup VALUES (1957810842)
INSERT INTO @tblLookup VALUES (3939845945)
INSERT INTO @tblLookup VALUES (2647816111)
INSERT INTO @tblLookup VALUES (81470997)
INSERT INTO @tblLookup VALUES (1943803523)
INSERT INTO @tblLookup VALUES (3814918930)
INSERT INTO @tblLookup VALUES (2489596804)
INSERT INTO @tblLookup VALUES (225274430)
INSERT INTO @tblLookup VALUES (2053790376)
INSERT INTO @tblLookup VALUES (3826175755)
INSERT INTO @tblLookup VALUES (2466906013)
INSERT INTO @tblLookup VALUES (167816743)
INSERT INTO @tblLookup VALUES (2097651377)
INSERT INTO @tblLookup VALUES (4027552580)
INSERT INTO @tblLookup VALUES (2265490386)
INSERT INTO @tblLookup VALUES (503444072)
INSERT INTO @tblLookup VALUES (1762050814)
INSERT INTO @tblLookup VALUES (4150417245)
INSERT INTO @tblLookup VALUES (2154129355)
INSERT INTO @tblLookup VALUES (426522225)
INSERT INTO @tblLookup VALUES (1852507879)
INSERT INTO @tblLookup VALUES (4275313526)
INSERT INTO @tblLookup VALUES (2312317920)
INSERT INTO @tblLookup VALUES (282753626)
INSERT INTO @tblLookup VALUES (1742555852)
INSERT INTO @tblLookup VALUES (4189708143)
INSERT INTO @tblLookup VALUES (2394877945)
INSERT INTO @tblLookup VALUES (397917763)
INSERT INTO @tblLookup VALUES (1622183637)
INSERT INTO @tblLookup VALUES (3604390888)
INSERT INTO @tblLookup VALUES (2714866558)
INSERT INTO @tblLookup VALUES (953729732)
INSERT INTO @tblLookup VALUES (1340076626)
INSERT INTO @tblLookup VALUES (3518719985)
INSERT INTO @tblLookup VALUES (2797360999)
INSERT INTO @tblLookup VALUES (1068828381)
INSERT INTO @tblLookup VALUES (1219638859)
INSERT INTO @tblLookup VALUES (3624741850)
INSERT INTO @tblLookup VALUES (2936675148)
INSERT INTO @tblLookup VALUES (906185462)
INSERT INTO @tblLookup VALUES (1090812512)
INSERT INTO @tblLookup VALUES (3747672003)
INSERT INTO @tblLookup VALUES (2825379669)
INSERT INTO @tblLookup VALUES (829329135)
INSERT INTO @tblLookup VALUES (1181335161)
INSERT INTO @tblLookup VALUES (3412177804)
INSERT INTO @tblLookup VALUES (3160834842)
INSERT INTO @tblLookup VALUES (628085408)
INSERT INTO @tblLookup VALUES (1382605366)
INSERT INTO @tblLookup VALUES (3423369109)
INSERT INTO @tblLookup VALUES (3138078467)
INSERT INTO @tblLookup VALUES (570562233)
INSERT INTO @tblLookup VALUES (1426400815)
INSERT INTO @tblLookup VALUES (3317316542)
INSERT INTO @tblLookup VALUES (2998733608)
INSERT INTO @tblLookup VALUES (733239954)
INSERT INTO @tblLookup VALUES (1555261956)
INSERT INTO @tblLookup VALUES (3268935591)
INSERT INTO @tblLookup VALUES (3050360625)
INSERT INTO @tblLookup VALUES (752459403)
INSERT INTO @tblLookup VALUES (1541320221)
INSERT INTO @tblLookup VALUES (2607071920)
INSERT INTO @tblLookup VALUES (3965973030)
INSERT INTO @tblLookup VALUES (1969922972)
INSERT INTO @tblLookup VALUES (40735498)
INSERT INTO @tblLookup VALUES (2617837225)
INSERT INTO @tblLookup VALUES (3943577151)
INSERT INTO @tblLookup VALUES (1913087877)
INSERT INTO @tblLookup VALUES (83908371)
INSERT INTO @tblLookup VALUES (2512341634)
INSERT INTO @tblLookup VALUES (3803740692)
INSERT INTO @tblLookup VALUES (2075208622)
INSERT INTO @tblLookup VALUES (213261112)
INSERT INTO @tblLookup VALUES (2463272603)
INSERT INTO @tblLookup VALUES (3855990285)
INSERT INTO @tblLookup VALUES (2094854071)
INSERT INTO @tblLookup VALUES (198958881)
INSERT INTO @tblLookup VALUES (2262029012)
INSERT INTO @tblLookup VALUES (4057260610)
INSERT INTO @tblLookup VALUES (1759359992)
INSERT INTO @tblLookup VALUES (534414190)
INSERT INTO @tblLookup VALUES (2176718541)
INSERT INTO @tblLookup VALUES (4139329115)
INSERT INTO @tblLookup VALUES (1873836001)
INSERT INTO @tblLookup VALUES (414664567)
INSERT INTO @tblLookup VALUES (2282248934)
INSERT INTO @tblLookup VALUES (4279200368)
INSERT INTO @tblLookup VALUES (1711684554)
INSERT INTO @tblLookup VALUES (285281116)
INSERT INTO @tblLookup VALUES (2405801727)
INSERT INTO @tblLookup VALUES (4167216745)
INSERT INTO @tblLookup VALUES (1634467795)
INSERT INTO @tblLookup VALUES (376229701)
INSERT INTO @tblLookup VALUES (2685067896)
INSERT INTO @tblLookup VALUES (3608007406)
INSERT INTO @tblLookup VALUES (1308918612)
INSERT INTO @tblLookup VALUES (956543938)
INSERT INTO @tblLookup VALUES (2808555105)
INSERT INTO @tblLookup VALUES (3495958263)
INSERT INTO @tblLookup VALUES (1231636301)
INSERT INTO @tblLookup VALUES (1047427035)
INSERT INTO @tblLookup VALUES (2932959818)
INSERT INTO @tblLookup VALUES (3654703836)
INSERT INTO @tblLookup VALUES (1088359270)
INSERT INTO @tblLookup VALUES (936918000)
INSERT INTO @tblLookup VALUES (2847714899)
INSERT INTO @tblLookup VALUES (3736837829)
INSERT INTO @tblLookup VALUES (1202900863)
INSERT INTO @tblLookup VALUES (817233897)
INSERT INTO @tblLookup VALUES (3183342108)
INSERT INTO @tblLookup VALUES (3401237130)
INSERT INTO @tblLookup VALUES (1404277552)
INSERT INTO @tblLookup VALUES (615818150)
INSERT INTO @tblLookup VALUES (3134207493)
INSERT INTO @tblLookup VALUES (3453421203)
INSERT INTO @tblLookup VALUES (1423857449)
INSERT INTO @tblLookup VALUES (601450431)
INSERT INTO @tblLookup VALUES (3009837614)
INSERT INTO @tblLookup VALUES (3294710456)
INSERT INTO @tblLookup VALUES (1567103746)
INSERT INTO @tblLookup VALUES (711928724)
INSERT INTO @tblLookup VALUES (3020668471)
INSERT INTO @tblLookup VALUES (3272380065)
INSERT INTO @tblLookup VALUES (1510334235)
INSERT INTO @tblLookup VALUES (755167117)

DECLARE @crc BIGINT, @len INT, @i INT, @index INT
DECLARE @tblval BIGINT
SET @crc = 0xFFFFFFFF
SET @len = LEN(@input)
SET @i = 1

WHILE @i <= @len
BEGIN
    SET @index = ((@crc & 0xff) ^ ASCII(SUBSTRING(@input, @i, 1)))  
    SET @tblval = (SELECT Value FROM @tblLookup WHERE ID = @Index)
    SET @crc = (@crc / 256) ^ @tblval   
    SET @i = @i + 1 
END
SET @crc = ~@crc

SELECT @crc as CRC32, CONVERT(VARBINARY(4), @crc) as CRC32Hex