Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot
Sometimes you need to get a list of tables from your database. This could be to help with testing, to see what tables exist before youcreate a tableor remove one, or some other reason. If you've forgotten the name of a specific table, or forgotten how to spell a table (was it plu...
Query below lists all table columns in a database. Query selectschema_name(tab.schema_id)asschema_name, tab.nameastable_name, col.column_id, col.nameascolumn_name, t.nameasdata_type, col.max_length, col.precisionfromsys.tablesastabinnerjoinsys.columnsascolontab.object_id = col.object_id...
datainfo varchar(20), index_size varchar(20), unused varchar(20) ) DECLARE @tablename varchar(255); DECLARE Info_cursor CURSOR FOR SELECT [name] FROM sys.tables WHERE type='U'; OPEN Info_cursor FETCH NEXT FROM Info_cursor INTO @tablename WHILE @@FETCH_STATUS = 0 BEGIN insert into @t...
Database Database 属性 方法 BeginTransaction CompatibleWithModel Create CreateIfNotExists Delete Equals ExecuteSqlCommand ExecuteSqlCommandAsync Exists GetHashCode GetType Initialize SetInitializer SqlQuery ToString UseTransaction DbConfiguration DbConfigurationTypeAttribute ...
Applies to: Azure SQL Database In this quickstart, connect to an Azure SQL database in the Azure portal and use query editor to run Transact-SQL (T-SQL) queries. The Azure SQL Database query editor (preview) is a tool to run SQL queries against Azure SQL Database in the Azure portal...
obdumper ... --query-sql "select id,name from t" --where "a=1" 问题原因 --query-sql 和--where 不能搭配使用,条件需要写在 query-sql 语句内。 --where 只能配合 --table 使用。 解决方法 导出语句改为如下即可。 obdumper ... --query-sql "select id,name from t where a=1 " 上...
基本思路,用Sql.Database函数,四个参数分别为:数据库ip地址,数据库名称,sql语句,timeout时长。 构建四个参数。 let SKU明细 = Table.TransformColumnTypes(Excel.CurrentWorkbook(){[Name="SKU"]}[Content],{{"SKU", type text}})[SKU], //取表中的sku 计数 = List.Count(SKU明细)-1, //计数用在后续...
USE master; GO SELECT dbid, object_id, query_plan FROM sys.dm_exec_cached_plans AS cp CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle); GO M. 使用 FOR SYSTEM_TIME 適用於:SQL Server 2016 (13.x) 和更新版本,以及 SQL Database。 下列範例會使用 FOR SYSTEM_TIME AS OF *date_time_...
The output fromEXPLAINshowsALLin thetypecolumn when MySQL uses afull table scanto resolve a query. 慢SQL 分析与优化 https://mp.weixin.qq.com/s/CaSVhAJgycjjbCxAkII2ZA 从系统设计角度看,一个系统从设计搭建到数据逐步增长,SQL 执行效率可能会出现劣化,为继续支撑业务发展,我们需要对慢 SQL 进行分析和...