How to: Count columns in a table?

Question

Quite simple question actually. How do I count the number of columns in a table using SQL?

Answer 1

For AdventureWorks2012 tables & views:
SELECT TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COUNT(COLUMN_NAME ) ColCount
FROM INFORMATION_SCHEMA.COLUMNS
GROUP BY TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME
ORDER BY TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME;
TABLE_SCHEMA TABLE_NAME ColCount
dbo AWBuildVersion 4
dbo DatabaseLog 8
dbo ErrorLog 9
HumanResources Department 4
HumanResources Employee 16
HumanResources EmployeeDepartmentHistory 6
HumanResources EmployeePayHistory 5
HumanResources JobCandidate 4
HumanResources Shift 5
HumanResources vEmployee 18
HumanResources vEmployeeDepartment 10
HumanResources vEmployeeDepartmentHistory 11
HumanResources vJobCandidate 16
HumanResources vJobCandidateEducation 13
HumanResources vJobCandidateEmployment 11
Person Address 9
Person AddressType 4
Person BusinessEntity 3
Person BusinessEntityAddress 5
Person BusinessEntityContact 5
Person ContactType 3
Person CountryRegion 3
Person EmailAddress 5
Person Password 5
Person Person 13
Person PersonPhone 4
Person PhoneNumberType 3
Person StateProvince 8
Person vAdditionalContactInfo 17
Person vStateProvinceCountryRegion 7
Production BillOfMaterials 9
Production Culture 3
Production Document 14
Production Illustration 3
Production Location 5
Production Product 25
Production ProductCategory 4
Production ProductCostHistory 5
Production ProductDescription 4
Production ProductDocument 3
Production ProductInventory 7
Production ProductListPriceHistory 5
Production ProductModel 6
Production ProductModelIllustration 3
Production ProductModelProductDescriptionCulture 4
Production ProductPhoto 6
Production ProductProductPhoto 4
Production ProductReview 8
Production ProductSubcategory 5
Production ScrapReason 3
Production TransactionHistory 9
Production TransactionHistoryArchive 9
Production UnitMeasure 3
Production vProductAndDescription 5
Production vProductModelCatalogDescription 25
Production vProductModelInstructions 11
Production WorkOrder 10
Production WorkOrderRouting 12
Purchasing ProductVendor 11
Purchasing PurchaseOrderDetail 11
Purchasing PurchaseOrderHeader 13
Purchasing ShipMethod 6
Purchasing Vendor 8
Purchasing vVendorWithAddresses 9
Purchasing vVendorWithContacts 12
Sales CountryRegionCurrency 3
Sales CreditCard 6
Sales Currency 3
Sales CurrencyRate 7
Sales Customer 7
Sales PersonCreditCard 3
Sales SalesOrderDetail 11
Sales SalesOrderHeader 26
Sales SalesOrderHeaderSalesReason 3
Sales SalesPerson 9
Sales SalesPersonQuotaHistory 5
Sales SalesReason 4
Sales SalesTaxRate 7
Sales SalesTerritory 10
Sales SalesTerritoryHistory 6
Sales ShoppingCartItem 6
Sales SpecialOffer 11
Kalman Toth Database & OLAP Architect
sqlusa.com
Paperback / Kindle: Pass SQL Exam 70-461 & Job Interview: Programming SQL Server 2012