-- A minimalist variable declaration>DECLAREmyvar =5; >VALUES(myvar); 5-- Using a variable with an IDENTIFIER clause>DECLAREcolnameSTRING; >SETVARcolname ='c1'; >SELECTIDENTIFIER(colname)FROMVALUES(1,2)AST(c1, c2); 1 >SETVARcolname ='c2'; >SELECTIDENTIFIER(colname)FROMVALUES(1,2)AST...
When a new row is added to the table, SQL Server provides a unique incremental value for the column. Identity columns are commonly used with PRIMARY KEY constraints to serve as the unique row identifier for the table. The IDENTITY property can be assigned to tinyint, smallint, int, decimal...
Indicates that the new column is an identity column. When a new row is added to the table, SQL Server provides a unique incremental value for the column. Identity columns are commonly used with PRIMARY KEY constraints to serve as the unique row identifier for the table. The IDENTITY property...
Creates a session private, temporary variable you can reference wherever a constant expression can be used. You can also use variables in combination with theIDENTIFIER clauseto parameterize identifiers in SQL statements. Variables are modified using theSET VARIABLEstatement. Temporary variables cannot be...
-- Begin a transactionbegin;-- Declare a cursordeclarelollapaloozacursorforselecteventname, starttime, pricepaid/qtysoldascostperticket, qtysoldfromsales, eventwheresales.eventid=event.eventidandeventname='Lollapalooza';-- Fetch the first 5 rows in the cursor lollapalooza:fetchforward5fromlollapalooza...
system-object-identifier 不得與現行伺服器上已存在的表格、視圖、別名或索引相同。 system-object-identifier 必須是不完整的系統 ID。 當指定 system-object-identifier 時, table-name 不能是有效的系統物件名稱。直欄定義 定義直欄的屬性。 至少必須有一個直欄定義,且不超過 8000 個直欄定義。
When a new row is added to the table, SQL Server provides a unique incremental value for the column. Identity columns are commonly used with PRIMARY KEY constraints to serve as the unique row identifier for the table. The IDENTITY property can be assigned to tinyint, smallint,...
User_Variable := "@"+Unquoted_Identifier. Variables allow you to name scalar and rowset expressions. A simple example should illustrate how this works: U-SQL 复制 DECLARE @city string = "Seattle"; You can do more than store simple values. You can use C# Expressions to compute values...
Le type de données de la colonne doit être une chaîne de caractères avec un attribut de longueur supérieur ou égal à l'attribut de longueur du registre spécial CURRENT SQLID. NULL Spécifie null comme valeur par défaut pour la colonne. Si NOT NULL a été spécifié, DEFAULT NULL ...
Use the following syntax to declare a cursor. <cursor_declaration> ::= <cursor_name> CURSOR FOR <query> Where: cursor_name The name to give the cursor. This can be any valid Snowflake identifier that is not already in use in this block. The identifier is used by other cursor-related...