so as to avoid halt during query execution. Oracle reads the same variable whenever encountered in an SQL query. It is in ON state by default. With the help of DEFINE clause, one can declare a variable in command line before query execution...
ENTITY "SQL Server Management Studio" AS SSMS ENTITY "查询窗口" AS QueryWindow ENTITY "变量声明" AS DeclareVariable ENTITY "变量定义" AS DefineVariable ENTITY "变量赋值" AS AssignValue ENTITY "变量使用" AS UseVariable SSMS --|> QueryWindow QueryWindow --|> DeclareVariable QueryWindow --|> ...
SQL> help define DEFINE---Specifies a substitutionvariableandassigns a CHAR valuetoit,orlists the valueandvariabletypeofa singlevariableorallvariables. DEF[INE] [variable] | [variable=text]variable:定义的变量名text:变量的char值 例子: --使用define命令定义vtest变量,并分配给它一个char值test123SQL>d...
TableVariableTransactionsDoNotSupportParallelNestedTransaction 表变量事务不支持并行嵌套事务。 DMLQueryReturnsOutputToClient DML 查询将输出返回到客户端,并且不可并行化。 MixedSerialAndParallelOnlineIndexBuildNotSupported 单个联机索引生成的串行和并行计划组合不受支持。 CouldNotGenerateValidParallelPlan 验证并行计划失败...
The CREATE TABLE command is used to create a table in SQL. The following statement creates a table named Employees that has three columns: employee_ID, last_name and first_name, with the first column storing integer (int) data and the other columns storing variable character data of type va...
A table variable isn't necessarily memory resident. Under memory pressure, the pages belonging to a table variable can be pushed out totempdb. You can define an inline index in a table variable. A cursor variable that currently has a cursor assigned to it can be referenced as a source in...
Specifies that a series of Transact-SQL statements, which together don't produce a side effect such as modifying a table, define the value of the function. function_body is used only in scalar functions and multi-statement table-valued functions (MSTVFs). In scalar functions, function_body is...
SQL_PROCEDURE_TERM 1.0 A character string with the data source vendor's name for a procedure; for example, "database procedure", "stored procedure", "procedure", "package", or "stored query". SQL_PROCEDURES 1.0 A character string: "Y" if the data source supports procedures and the driver...
是过程语言(Procedural Language)与结构化查询语言(SQL)结合而成的编程语言.通过增加变量、控制语句,使我们可以写一些逻辑更加复杂的数据库操作.
(6) DEFINE aw_sales_dims COMPOSITE <aw_prod_id aw_cust_id - aw_channel_id aw_promo_id> DEFINE aw_sales_quantity_sold VARIABLE NUMBER (3) <aw_date aw_sales_dims - <aw_prod_id aw_cust_id aw_date aw_channel_id aw_promo_id>> DEFINE aw_sales_amount_sold VARIABLE NUMBER (10,2)...