如何删除microsoft sql server中特定列的空格以外的所有特殊字符和数字?
答案 0 :(得分:0)
上面的链接都使用循环来解决这个问题。对于这种类型的东西,没有必要求助于循环。相反,我们可以使用计数表。我在这个系统中保留了一个计数表作为一个视图。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<modelVersion>4.0.0</modelVersion>
<groupId>io.github.carldata</groupId>
<artifactId>InsertDataTrigger</artifactId>
<version>1.0</version>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.cassandra/cassandra-all -->
<dependency>
<groupId>org.apache.cassandra</groupId>
<artifactId>cassandra-all</artifactId>
<version>3.11.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.11.0.0</version>
</dependency>
</dependencies>
</project>
现在我们可以将该计数用作一组。这比基于循环的解决方案快得多。
create View [dbo].[cteTally] as
WITH
E1(N) AS (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1))dt(n)),
E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
cteTally(N) AS
(
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
)
select N from cteTally
GO