Check ISIN format with an SQL Function
Create a function to Check the ISIN format in SQL Server
Context
This code was created as part of an import routine to cleanse data coming in from external sources, where there were all sorts of characters that shouldn't have been there.
This one checks the format of an ISIN.
This is expanded SQL code using the documentation on the Wikipedia article on the link. You will need to create the following table to hold all of the country information.
This is part of three linked articles which will check ISIN, SEDOL and CUSIP identifiers.
Create and populate table
CREATE TABLE SecuritiesIssuer(
SecuritiesIssuerID intIDENTITY(1,1) NOT NULL CONSTRAINT PK_SecuritiesIssuerID PRIMARY KEY,
SecuritiesIssuerShort NVARCHAR(2) NULL,
SecuritiesIssuerCountry NVARCHAR(50) NULL)
INSERT INTO SecuritiesIssuer
SELECT *
FROM (VALUES
('AF',N'AFGHANISTAN'),
('AX',N'ÅLAND ISLANDS'),
('AL',N'ALBANIA'),
('DZ',N'ALGERIA'),
('AS',N'AMERICAN SAMOA'),
('AD',N'ANDORRA'),
('AO',N'ANGOLA'),
('AI',N'ANGUILLA'),
('AQ',N'ANTARCTICA'),
('AG',N'ANTIGUA AND BARBUDA'),
('AR',N'ARGENTINA'),
('AM',N'ARMENIA'),
('AW',N'ARUBA'),
('AU',N'AUSTRALIA'),
('AT',N'AUSTRIA'),
('AZ',N'AZERBAIJAN'),
('BS',N'BAHAMAS'),
('BH',N'BAHRAIN'),
('BD',N'BANGLADESH'),
('BB',N'BARBADOS'),
('BY',N'BELARUS'),
('BE',N'BELGIUM'),
('BZ',N'BELIZE'),
('BJ',N'BENIN'),
('BM',N'BERMUDA'),
('BT',N'BHUTAN'),
('BO',N'BOLIVIA, PLURINATIONAL STATE OF'),
('BQ',N'BONAIRE, SINT EUSTATIUS AND SABA'),
('BA',N'BOSNIA AND HERZEGOVINA'),
('BW',N'BOTSWANA'),
('BV',N'BOUVET ISLAND'),
('BR',N'BRAZIL'),
('IO',N'BRITISH INDIAN OCEAN TERRITORY'),
('BN',N'BRUNEI DARUSSALAM'),
('BG',N'BULGARIA'),
('BF',N'BURKINA FASO'),
('BI',N'BURUNDI'),
('KH',N'CAMBODIA'),
('CM',N'CAMEROON'),
('CA',N'CANADA'),
('CV',N'CAPE VERDE'),
('KY',N'CAYMAN ISLANDS'),
('CF',N'CENTRAL AFRICAN REPUBLIC'),
('TD',N'CHAD'),
('CL',N'CHILE'),
('CN',N'CHINA'),
('CX',N'CHRISTMAS ISLAND'),
('CC',N'COCOS (KEELING) ISLANDS'),
('CO',N'COLOMBIA'),
('KM',N'COMOROS'),
('CG',N'CONGO'),
('CD',N'CONGO, THE DEMOCRATIC REPUBLIC OF THE'),
('CK',N'COOK ISLANDS'),
('CR',N'COSTA RICA'),
('CI',N'CÔTE D’IVOIRE'),
('HR',N'CROATIA'),
('CU',N'CUBA'),
('CW',N'CURAÇAO'),
('CY',N'CYPRUS'),
('CZ',N'CZECH REPUBLIC'),
('DK',N'DENMARK'),
('DJ',N'DJIBOUTI'),
('DM',N'DOMINICA'),
('DO',N'DOMINICAN REPUBLIC'),
('EC',N'ECUADOR'),
('EG',N'EGYPT'),
('SV',N'EL SALVADOR'),
('GQ',N'EQUATORIAL GUINEA'),
('ER',N'ERITREA'),
('EE',N'ESTONIA'),
('ET',N'ETHIOPIA'),
('FK',N'FALKLAND ISLANDS (MALVINAS)'),
('FO',N'FAROE ISLANDS'),
('FJ',N'FIJI'),
('FI',N'FINLAND'),
('FR',N'FRANCE'),
('GF',N'FRENCH GUIANA'),
('PF',N'FRENCH POLYNESIA'),
('TF',N'FRENCH SOUTHERN TERRITORIES'),
('GA',N'GABON'),
('GM',N'GAMBIA'),
('GE',N'GEORGIA'),
('DE',N'GERMANY'),
('GH',N'GHANA'),
('GI',N'GIBRALTAR'),
('GR',N'GREECE'),
('GL',N'GREENLAND'),
('GD',N'GRENADA'),
('GP',N'GUADELOUPE'),
('GU',N'GUAM'),
('GT',N'GUATEMALA'),
('GG',N'GUERNSEY'),
('GN',N'GUINEA'),
('GW',N'GUINEA-BISSAU'),
('GY',N'GUYANA'),
('HT',N'HAITI'),
('HM',N'HEARD ISLAND AND MCDONALD ISLANDS'),
('VA',N'HOLY SEE (VATICAN CITY STATE)'),
('HN',N'HONDURAS'),
('HK',N'HONG KONG'),
('HU',N'HUNGARY'),
('IS',N'ICELAND'),
('IN',N'INDIA'),
('ID',N'INDONESIA'),
('IR',N'IRAN, ISLAMIC REPUBLIC OF'),
('IQ',N'IRAQ'),
('IE',N'IRELAND'),
('IM',N'ISLE OF MAN'),
('IL',N'ISRAEL'),
('IT',N'ITALY'),
('JM',N'JAMAICA'),
('JP',N'JAPAN'),
('JE',N'JERSEY'),
('JO',N'JORDAN'),
('KZ',N'KAZAKHSTAN'),
('KE',N'KENYA'),
('KI',N'KIRIBATI'),
('KP',N'KOREA, DEMOCRATIC PEOPLE’S REPUBLIC OF'),
('KR',N'KOREA, REPUBLIC OF'),
('KW',N'KUWAIT'),
('KG',N'KYRGYZSTAN'),
('LA',N'LAO PEOPLE’S DEMOCRATIC REPUBLIC'),
('LV',N'LATVIA'),
('LB',N'LEBANON'),
('LS',N'LESOTHO'),
('LR',N'LIBERIA'),
('LY',N'LIBYA'),
('LI',N'LIECHTENSTEIN'),
('LT',N'LITHUANIA'),
('LU',N'LUXEMBOURG'),
('MO',N'MACAO'),
('MK',N'MACEDONIA, THE FORMER YUGOSLAV REPUBLIC OF'),
('MG',N'MADAGASCAR'),
('MW',N'MALAWI'),
('MY',N'MALAYSIA'),
('MV',N'MALDIVES'),
('ML',N'MALI'),
('MT',N'MALTA'),
('MH',N'MARSHALL ISLANDS'),
('MQ',N'MARTINIQUE'),
('MR',N'MAURITANIA'),
('MU',N'MAURITIUS'),
('YT',N'MAYOTTE'),
('MX',N'MEXICO'),
('FM',N'MICRONESIA, FEDERATED STATES OF'),
('MD',N'MOLDOVA, REPUBLIC OF'),
('MC',N'MONACO'),
('MN',N'MONGOLIA'),
('ME',N'MONTENEGRO'),
('MS',N'MONTSERRAT'),
('MA',N'MOROCCO'),
('MZ',N'MOZAMBIQUE'),
('MM',N'MYANMAR'),
('NA',N'NAMIBIA'),
('NR',N'NAURU'),
('NP',N'NEPAL'),
('NL',N'NETHERLANDS'),
('NC',N'NEW CALEDONIA'),
('NZ',N'NEW ZEALAND'),
('NI',N'NICARAGUA'),
('NE',N'NIGER'),
('NG',N'NIGERIA'),
('NU',N'NIUE'),
('NF',N'NORFOLK ISLAND'),
('MP',N'NORTHERN MARIANA ISLANDS'),
('NO',N'NORWAY'),
('OM',N'OMAN'),
('PK',N'PAKISTAN'),
('PW',N'PALAU'),
('PS',N'PALESTINIAN TERRITORY, OCCUPIED'),
('PA',N'PANAMA'),
('PG',N'PAPUA NEW GUINEA'),
('PY',N'PARAGUAY'),
('PE',N'PERU'),
('PH',N'PHILIPPINES'),
('PN',N'PITCAIRN'),
('PL',N'POLAND'),
('PT',N'PORTUGAL'),
('PR',N'PUERTO RICO'),
('QA',N'QATAR'),
('RE',N'RÉUNION'),
('RO',N'ROMANIA'),
('RU',N'RUSSIAN FEDERATION'),
('RW',N'RWANDA'),
('BL',N'SAINT BARTHÉLEMY'),
('SH',N'SAINT HELENA, ASCENSION AND TRISTAN DA CUNHA'),
('KN',N'SAINT KITTS AND NEVIS'),
('LC',N'SAINT LUCIA'),
('MF',N'SAINT MARTIN (FRENCH PART)'),
('PM',N'SAINT PIERRE AND MIQUELON'),
('VC',N'SAINT VINCENT AND THE GRENADINES'),
('WS',N'SAMOA'),
('SM',N'SAN MARINO'),
('ST',N'SAO TOME AND PRINCIPE'),
('SA',N'SAUDI ARABIA'),
('SN',N'SENEGAL'),
('RS',N'SERBIA'),
('SC',N'SEYCHELLES'),
('SL',N'SIERRA LEONE'),
('SG',N'SINGAPORE'),
('SX',N'SINT MAARTEN (DUTCH PART)'),
('SK',N'SLOVAKIA'),
('SI',N'SLOVENIA'),
('SB',N'SOLOMON ISLANDS'),
('SO',N'SOMALIA'),
('ZA',N'SOUTH AFRICA'),
('GS',N'SOUTH GEORGIA AND THE SOUTH SANDWICH ISLANDS'),
('SS',N'SOUTH SUDAN'),
('ES',N'SPAIN'),
('LK',N'SRI LANKA'),
('SD',N'SUDAN'),
('SR',N'SURINAME'),
('SJ',N'SVALBARD AND JAN MAYEN'),
('SZ',N'SWAZILAND'),
('SE',N'SWEDEN'),
('CH',N'SWITZERLAND'),
('SY',N'SYRIAN ARAB REPUBLIC'),
('TW',N'TAIWAN, PROVINCE OF CHINA'),
('TJ',N'TAJIKISTAN'),
('TZ',N'TANZANIA, UNITED REPUBLIC OF'),
('TH',N'THAILAND'),
('TL',N'TIMOR-LESTE'),
('TG',N'TOGO'),
('TK',N'TOKELAU'),
('TO',N'TONGA'),
('TT',N'TRINIDAD AND TOBAGO'),
('TN',N'TUNISIA'),
('TR',N'TURKEY'),
('TM',N'TURKMENISTAN'),
('TC',N'TURKS AND CAICOS ISLANDS'),
('TV',N'TUVALU'),
('UG',N'UGANDA'),
('UA',N'UKRAINE'),
('AE',N'UNITED ARAB EMIRATES'),
('GB',N'UNITED KINGDOM'),
('US',N'UNITED STATES'),
('UM',N'UNITED STATES MINOR OUTLYING ISLANDS'),
('UY',N'URUGUAY'),
('UZ',N'UZBEKISTAN'),
('VU',N'VANUATU'),
('VE',N'VENEZUELA, BOLIVARIAN REPUBLIC OF'),
('VN',N'VIET NAM'),
('VG',N'VIRGIN ISLANDS, BRITISH'),
('VI',N'VIRGIN ISLANDS, U.S.'),
('WF',N'WALLIS AND FUTUNA'),
('EH',N'WESTERN SAHARA'),
('YE',N'YEMEN'),
('ZM',N'ZAMBIA'),
('ZW',N'ZIMBABWE'),
('XS',N'International')
) CountryData(Short, Country)SQL
CREATE FUNCTION CheckISIN(@ISIN NVARCHAR(12))
RETURNS INT AS BEGIN
DECLARE @Check INT
--Check Digit not available
IF RIGHT(@ISIN,1) NOT BETWEEN '0' AND '9' BEGIN
SET @Check=-1
RETURN @Check
END
--Check country not available
IF (SELECT COUNT(*) FROM SecuritiesIssuer WHERE SecuritiesIssuerShort=LEFT(@ISIN,2))=0 BEGIN
SET @Check=-2
RETURN @Check
END
IF PATINDEX('%[^0-Z]%',@ISIN)>0 BEGIN
SET @Check=-3
RETURN @Check
END
DECLARE @Data NVARCHAR(30)=LEFT(@ISIN,11)
DECLARE @MultOdd INT= 1, @MultEve INT= 1
DECLARE @Sum INT=0,@StrOdd NVARCHAR(60)='',@StrEve NVARCHAR(60)=''
DECLARE @Letter INT,@Text VARCHAR(1)
SET @Letter =PATINDEX('%[A-Z]%',@Data)
SET @Text=SUBSTRING(@Data,@Letter,1) BEGIN
WHILE @Letter>0 BEGIN
SET @Data=STUFF(@Data,@Letter,1,ASCII(UPPER(@Text))-55)
SET @Letter =PATINDEX('%[A-Z]%',@Data)
SET @Text=SUBSTRING(@Data,@Letter,1)
END
END
--Get Length Multiplier
IF LEN(@Data)%2=0 BEGIN
SET @MultEve = 2;
END
ELSE BEGIN
SET @MultOdd = 2;
SET @Letter = 1;
END
WHILE @Letter<=LEN(@Data) BEGIN
IF @Letter%2=1 BEGIN
SET @StrOdd=@StrOdd+CONVERT(VARCHAR(60),CONVERT(INT,SUBSTRING(@Data,@Letter,1))*@MultOdd);
END
ELSE BEGIN
SET @StrEve=@StrEve+CONVERT(VARCHAR(60),CONVERT(INT,SUBSTRING(@Data,@Letter,1))*@MultEve);
END
SET @Letter=@Letter+1
END
SET @Data=@StrOdd+@StrEve
SET @Letter = 1
WHILE @Letter<=LEN(@Data) BEGIN
SET @Sum=@Sum+CONVERT(INT,SUBSTRING(@Data,@Letter,1))
SET @Letter=@Letter+1
END
IF LEN(@ISIN)<>12 BEGIN
SET @Check=-4
RETURN @Check
END
IF ISNULL(@Check,0)=0 BEGIN
SET @Check =(SELECT (CASE WHEN RIGHT(@ISIN,1)=CONVERT(VARCHAR(1),(10-(@Sum%10))%10) THEN 1 ELSE 0 END));
END
RETURN @Check
END
GO
SELECT dbo.CheckISIN('US0378331005')
SELECT dbo.CheckISIN('AU0000XVGZA3')
SELECT dbo.CheckISIN('GB0002634946')Warning!
This will only check the format of the ISIN, not whether it actually exists and is valid.
Check a SEDOL
Check a CUSIP
