在本快速入门中,你将了解如何使用 Visual Studio Code 的 MSSQL 扩展连接到数据库,无论数据库是在本地、容器中还是在云中运行。 然后,你将了解如何使用 Transact-SQL (T-SQL) 语句创建数据库、定义表、插入数据和查询结果。 先决条件 若要完成本快速入门,必须具备以下条件: ...
2- 插入单行 | Inserting a Row 05:47 3- 插入多行 | Inserting Multiple Rows 03:19 4- 插入分层行 | Inserting Hierarchical Rows 05:54 5- 创建表复制 | Creating a Copy of a Table 08:48 6- 更新单行 | Updating a Single Row 03:56 7- 更新多行 | Updating Multiple Rows 03:15 8- 在Up...
Syntax for Transact-SQL multi-statement table-valued functions. syntaxsql 复制 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS...
Syntax for Transact-SQL inline table-valued functions. syntaxsql 複製 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS TABLE [...
CREATE TABLE t1 (a INT, b INT, c AS a/b); CREATE UNIQUE CLUSTERED INDEX Idx1 ON t1(c); INSERT INTO t1 VALUES (1, 0); 有关详细信息,请参阅 计算列上的索引。 索引中的包含列 可以将非键列(称为包含列)添加到非聚集索引的叶级别,从而通过涵盖查询来提高查询性能。 也就是说,查询中引用...
若用下列SQL语句创建一个表:Create Table Student(Code Char(6) Primary Key Not Null, Name Char(10) Not Null, Sex Char(2), Age Integer Check 16<br/> A、('T03011', '李兰', '男', '19')<br/> B、('T08002', NULL, '女', 20)<br/> C、('T05007', '曾泉', NULL, 21)<br
CREATE TABLE t1 (a int, b int, c AS a/b); CREATE UNIQUE CLUSTERED INDEX Idx1 ON t1(c); INSERT INTO t1 VALUES (1, 0); 有关详细信息,请参阅为计算列创建索引。 索引中的包含列 可以将非键列(称为包含列)添加到非聚集索引的叶级别,从而通过涵盖查询来提高查询性能。也就是说,查询中引用的所...
若用下列SQL语句创建一个表:Create Table Student(Code Char(6) Primary Key , Name Char(10) Not Null, Char(2), Age Integer Check 16 A. ('T03011', '李兰', '男', '19') B. ('T08002', NULL, '女', 20) C. ('T05007', '曾泉', NULL, 17) D. ('T03009', '高虹', '女...
SQL is one of the most popular database programming languages that is used for creating, modifying, retrieving, and manipulating data in databases. If you’re planning to make a career in the database domain, then you have landed at the right place. This blog on top SQL interview questions...
You usually can obtain the biggest gains by creating efficient data access code for the application and by using correct development techniques. You usually do not obtain such big gains in performance and scalability by changing SQL Server configuration settings.Figure 14.1 shows where your performance...