本文中的 Transact-SQL 代码示例使用AdventureWorks2022或AdventureWorksDW2022示例数据库,可从Microsoft SQL Server 示例和社区项目主页下载它。 A. 将 WHERE 与 LIKE 和 ESCAPE 语法配合使用 下面的示例将搜索以下行,其中的LargePhotoFileName列包含字符green_;由于_是通配符,因此使用了ESCAPE选项。 如果未指定ESCAPE该选...
嵌套查询中上层的查询块称为外侧查询或父查询,下层查询块称为内层查询或子查询。SQL语言允许多层嵌套,但是在子查询中不允许出现ORDER BY子句,ORDER BY子句只能用在最外层的查询块中。 嵌套查询的处理方法是:先处理最内侧的子查询,然后一层一层向上处理,直到最外层的查询块。 嵌套查询中的内层子查询通常作为搜索条件...
match_expression [ NOT ] LIKE pattern [ ESCAPE escape_character ] 参数含义: ① match_expression匹配表达式,一般为字符串表达式,pattern为在match_expression 中的搜索模式串。 ② pattern可以包含如表所示的通配符。 ③ escape_character为转义字符,必须是有效的单个SQL Server 字符,escape_character 没有默认值。
EXECUTE --动态地执行SQL 语句 DESCRIBE --描述准备好的查询 ---局部变量 declare @id char(10) --set @id = '10010001' select @id = '10010001' ---全局变量 ---必须以@@开头 --IF ELSE declare @x int @y int @z int select @x = 1 @y = 2 @z=3 ...
T-SQL Debugger Configure firewall rules before running the T-SQL Debugger Run the T-SQL Debugger Step Through T-SQL Code Debug Stored Procedures T-SQL Debugger Information T-SQL Breakpoints T-SQL Breakpoints Toggle a Breakpoint Enable, Disable, & Delete Breakpoints ...
Subclause 8.6, "<similar predicate>": <similar predicate> ::= <row value predicand> <similar predicate part 2> <similar predicate part 2> ::= [ NOT ] SIMILAR TO <similar pattern> [ ESCAPE <escape character> ] <similar pattern> ::= <character value expression> ... Conformance Rul...
representation>... ] <quote> }... ] <Unicode escape specifier> <Unicode representation> ::= <character representation> | <Unicode escape value> ... Conformance Rules Without Feature F393, "Unicode escapes in literals", conforming SQL language shall not contain a <Unicode character...
train signal sql serv train soptting train stock assemblin train excercise trainthe boy has been traincompartmentn trained experience trained pronghorn trainee erp consulta trainer and organizer training motivating s training employment training other materi training oe associate training and engineer trainin...
throughsql through termination through the nose through trunk supervi throught vehicle depo throw-away compiling throw-down study throw-out collar throwaway compiling throwaway rapid proto throw bread to the fi thrown weapon thr thresh threshold thru-hole thru hole thrust andlower guide th speed th...