SQL Server Соглашение по именованию и T-SQL правила программирования

Official Reference and useful links

SQL Server Object Name Convention

Object Code Notation Length Plural Prefix Suffix Abbreviation Char Mask Example
Database UPPERCASE 30 No No No Yes [A-z] MYDATABASE
Database Trigger PascalCase 50 No DTR_ No Yes [A-z] DTR_CheckLogin
Schema lowercase 30 No No No Yes [A-z][0-9] myschema
File Table PascalCase 128 No FT_ No Yes [A-z][0-9] FT_MyTable
Global Temporary Table PascalCase 118 No No No Yes ##[A-z][0-9] ##MyTable
Local Temporary Table PascalCase 118 No No No Yes #[A-z][0-9] #MyTable
Table U PascalCase 30 No No No Yes [A-z][0-9] MyTable
Table Column PascalCase 30 No No No Yes [A-z][0-9] MyColumn
Table Default Values D PascalCase 128 No DF_ No Yes [A-z][0-9] DF_MyTable_MyColumn
Table Check Column Constraint C PascalCase 128 No CK_ No Yes [A-z][0-9] CK_MyTable_MyColumn
Table Check Table Constraint C PascalCase 128 No CTK_ No Yes [A-z][0-9] CTK_MyTable_MyColumn_AnotherColumn
Table Primary Key PK PascalCase 128 No PK_ No Yes [A-z][0-9] PK_MyTableID
Table Alternative Key UQ PascalCase 128 No AK_ No Yes [A-z][0-9] AK_MyTable_MyColumn_AnotherColumn
Table Foreign Key F PascalCase 128 No FK_ No Yes [A-z][0-9] FK_MyTable_ForeignTableID
Table Clustered Index PascalCase 128 No IXC_ No Yes [A-z][0-9] IXC_MyTable_MyColumn_AnotherColumn
Table Non Clustered Index PascalCase 128 No IX_ No Yes [A-z][0-9] IX_MyTable_MyColumn_AnotherColumn
Table Trigger TR PascalCase 128 No TR_ No Yes [A-z][0-9] TR_MyTable_LogicalName
View V PascalCase 128 No VI_ No No [A-z][0-9] VI_LogicalName
Stored Procedure P PascalCase 128 No usp_ No No [A-z][0-9] usp_LogicalName
Scalar User-Defined Function FN PascalCase 50 No udf_ No No [A-z][0-9] udf_FunctionLogicalName
Table-Valued Function FN PascalCase 50 No tvf_ No No [A-z][0-9] tvf_FunctionLogicalName
Synonym SN camelCase 128 No sy_ No No [A-z][0-9] sy_logicalName
Sequence SO PascalCase 128 No sq_ No No [A-z][0-9] sq_TableName
CLR Assembly PascalCase 128 No CA No Yes [A-z][0-9] CALogicalName
CLR Stored Procedures PC PascalCase 128 No pc_ No Yes [A-z][0-9] pc_CAName_LogicalName
CLR Scalar User-Defined Function PascalCase 50 No cudf_ No No [A-z][0-9] cudf_CAName_LogicalName
CLR Table-Valued Function PascalCase 50 No ctvf_ No No [A-z][0-9] ctvf_CAName_LogicalName
CLR User-Defined Aggregates PascalCase 50 No ca_ No No [A-z][0-9] ca_CAName_LogicalName
CLR User-Defined Types PascalCase 50 No ct_ No No [A-z][0-9] ct_CAName_LogicalName
CLR Triggers PascalCase 50 No ctr_ No No [A-z][0-9] ctr_CAName_LogicalName

T-SQL Programming Style

SQL Server TSQL Coding Conventions, Best Practices, and Programming Guidelines

General programming style

Example:

SELECT t1.Value1 AS Val1
     , t1.Value2 AS Val2
     , t2.Value3 AS Val3
  INTO #Table3
  FROM dbo.Table1 AS t1
 INNER JOIN dbo.Table3 AS t2
         ON t1.Value1 = t2.Value1
 WHERE t1.Value1 > 1
   AND t2.Value2 >= 101
 ORDER BY t2.Value2;

Stored procedures and functions programming style

Stored Procedure Example:

IF OBJECT_ID('dbo.usp_StoredProcedure', 'P') IS NULL
EXECUTE('CREATE PROCEDURE dbo.usp_StoredProcedure as SELECT 1');
GO

ALTER PROCEDURE dbo.usp_StoredProcedure (
                @parameterValue1 SMALLINT
              , @parameterValue2 NVARCHAR(300)
)
/*
EXECUTE dbo.usp_StoredProcedure
        @parameterValue1 = 0
      , @parameterValue2 = N'BULK'
*/
AS
SET NOCOUNT ON;
BEGIN TRY
    IF (@parameterValue1 < 0 OR @parameterValue2 NOT IN ('SIMPLE', 'BULK', 'FULL'))
    RAISERROR('Not valid data parameter!', 16, 1);
    PRINT @parameterValue2;
END TRY

BEGIN CATCH
    -- Print error information. 
    PRINT 'Error: '       + CONVERT(varchar(50), ERROR_NUMBER())   +
          ', Severity: '  + CONVERT(varchar(5),  ERROR_SEVERITY()) +
          ', State: '     + CONVERT(varchar(5),  ERROR_STATE())    +
          ', Procedure: ' + ISNULL(ERROR_PROCEDURE(), '-')         +
          ', Line: '      + CONVERT(varchar(5),  ERROR_LINE())     +
          ', User name: ' + CONVERT(sysname,     CURRENT_USER);
    PRINT ERROR_MESSAGE();
END CATCH;
GO