A Common Table Expression (CTE) in SQL Server, defined using the WITH clause, is a temporary result set that simplifies complex queries by improving readability and maintainability. CTEs support recursive queries, enabling efficient handling of hierarchi
Virtual log file growth In previous versions of SQL Server, if the next growth is more than 1/8 of the current log size, and the growth is less than 64 MB, four VLFs were created. In SQL Server 2022 (16.x), this behavior is slightly different. Only one VLF is created if the grow...
Using a Common Table Expression also makes it easier to handle a scenario from a scalar subselect. A scalar subselect is a subquery that returns a single value for each row in the main query. For example, we want to categorize students based on their age at the time of enrollment. Whereas...
An in-memory table can have one columnstore index. You can create it when the table is created or add it later withALTER TABLE (Transact-SQL). Previously, only a disk-based table could have a columnstore index. A clustered columnstore index can have one or more nonclustered rowstore indexes...
I’ll explain this by using examples in DDL, using SQL Server syntax. The short version of this is fairly simple. Every table that you want to use in relations should have a primary key constraint; this can either be a single field or a combination of fields defined by an expression. ...
The sql in the annotation supports reading from the configuration The configured json is as follows:{ "mysqlSql": { "QueryListSql":"select * from customer", "QueryByPageSql":"select * from customer order by age", "UpdateByNameSql":"update customer set age=@age where name=@name", "...
What is SQL, in the SQL Server, is a common question asked. This article is meant to answer that question, while providing some history and context.
Table 22-92 Description of common states in the display switchover state command output System Backup Status Description Ready An active/standby switchover can be performed. No slave No standby MPU is available. BatchBackup Batch backup is being implemented. Configuration is...
Commonality and compatibility.SQL is widely used in various IT systems and is compatible with multiple other languages. Its commonality benefits beginners in the profession, as they are likely to use SQL throughout their careers. It also contributes to ease of application and improves the production...
Informix Server Workgroup Edition now supports FRAGMENT BY EXPRESSION partial index. Partial Index enables users to index only a subset of rows of a given table. By allowing to suppress indexing of certain values, indexes are kept small and efficient. For more information, seePartial Index in Fra...