Unlike the majority of the other data types in SQL Server, you cannot use a table variable as an input or an output parameter. In fact, a table variable is scoped to the stored procedure, batch, or user-defined function just like any local variable you create with a DECLARE statement. T...
We can create check constraints on the SQL table variables during the declaration of the table variable but these constraints can not be used by the optimizer. In the following query, we declare a table variable and we also add a check constraint that is similar to the SalesOrderHeader. 1 2...
Microsoft recommends table variables as a replacement of temporary tables when the data set is not very large (which is avague instruction—in the end it is up to you to test which table types work best in your environment). A table variable is a data type that can be used within a Tr...
Azure Databricks 會保留一些屬性索引鍵供自己使用,如果您嘗試使用這些密鑰,就會引發錯誤: external 使用CREATE EXTERNAL TABLE建立外部數據表。 location 使用LOCATION和ALTER TABLE的CREATE TABLE子句來設定數據表位置。 owner 使用[SET] OWNER TO和ALTER TABLE的ALTER VIEW語句來轉移表或檢視的擁有...
You can use theSELECT INTOstatement of SQL to assign values to PL/SQL variables. For each item in theSELECT list, there must be a corresponding, type-compatible variable in theINTO list. The following example illustrates the concept. Let us create a table named CUSTOMERS − ...
The column is computed from an expression that uses other columns in the same table. For example, a computed column can have the definition: cost AS price * qty. The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or...
CREATE TABLE 數據表屬性和數據表選項 CREATE TABLE 使用 Hive 格式 CREATE TABLE CONSTRAINT CREATE TABLE USING CREATE TABLE LIKE CREATE VIEW CREATE VOLUME DECLARE VARIABLE DROP CATALOG DROP CONNECTION DROP CREDENTIAL DROP DATABASE DROP FUNCTION 投遞地點 DROP PROVIDER DROP RECIPIENT DROP SCHEMA DROP SHARE ...
The table declaration includes column definitions, names, data types, and constraints. The only constraint types allowed are PRIMARY KEY, UNIQUE KEY, and NULL. For more information about the syntax, see CREATE TABLE (Transact-SQL), CREATE FUNCTION (Transact-SQL), and DECLARE @local_variable (...
SQLRETURN SQLTables( SQLHSTMT StatementHandle, SQLCHAR * CatalogName, SQLSMALLINT NameLength1, SQLCHAR * SchemaName, SQLSMALLINT NameLength2, SQLCHAR * TableName, SQLSMALLINT NameLength3, SQLCHAR * TableType, SQLSMALLINT NameLength4); 参数...
...n ] ) ] | user_defined_function [ [ AS ] table_alias ] | OPENXML <openxml_clause> | derived_table [ [ AS ] table_alias ] [ ( column_alias [ , ...n ] ) ] | <joined_table> | <pivoted_table> | <unpivoted_table> | @variable [ [ AS ] table_alias ] | @variable....