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数据库/批量增加非聚集索引.md

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+--声明一个变量
+```sql
+declare @tbname as nvarchar(100);
+```
+--声明一个游标用来遍历查询到的结果
+```sql
+declare C_userID CURSOR for
+select distinct TABLE_NAME from information_schema.COLUMNS
+where TABLE_NAME like '%_clean'
+```
+--打开游标
+```sql
+open C_userID;
+```
+--获取游标指向的数据
+```sql
+fetch next from C_userID into @tbname;
+while @@FETCH_STATUS = 0
+```
+BEGIN
+--执行具体的操作
+--创建非聚集索引
+--create NONCLUSTERED INDEX 索引名称 ON 表名(字段名)
+EXEC('create NONCLUSTERED INDEX '+'IX_'+@tbname+ ' ON '+@tbname+ '([Style] ASC,[aDatetime] DESC)')
+--游标指向下一条数据
+```sql
+FETCH next from C_userID into @tbname;
+```
+END
+--关闭游标
+CLose C_userID
+--释放游标
+DEALLOCATE C_userID;
+
+--声明一个变量
+```sql
+declare @tbname as nvarchar(100);
+```
+--声明一个游标用来遍历查询到的结果
+```sql
+declare C_userID CURSOR for
+select distinct TABLE_NAME from information_schema.COLUMNS
+where TABLE_NAME like '%_2020_APP'
+```
+--打开游标
+```sql
+open C_userID;
+```
+--获取游标指向的数据
+```sql
+fetch next from C_userID into @tbname;
+while @@FETCH_STATUS = 0
+```
+BEGIN
+--执行具体的操作
+--创建非聚集索引
+--create NONCLUSTERED INDEX 索引名称 ON 表名(字段名)
+EXEC('create NONCLUSTERED INDEX '+'IX_'+@tbname+ ' ON '+@tbname+ '([DeviceId] ASC,[CollectTime] DESC)')
+--游标指向下一条数据
+```sql
+FETCH next from C_userID into @tbname;
+```
+END
+--关闭游标
+CLose C_userID
+--释放游标   DEALLOCATE C_userID;