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Add TOP using recommendation

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Konstantin Taranov
2018-12-07 20:04:41 +03:00
parent d42b99b4d4
commit 9a54941512
1 changed files with 5 additions and 4 deletions
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SQL Server Name Convention and T-SQL Programming Style.md
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@@ -81,12 +81,13 @@ SQL Server TSQL Coding Conventions, Best Practices, and Programming Guidelines
SELECT FirstName
, LastName
```
- Keywords and data types declaration should be in **UPPERCASE**
- `FROM, WHERE, INTO, JOIN, GROUP BY, ORDER BY` expressions should be aligned so, that all their arguments are placed under each other
- All objects must used with schema names but without database and server name: `FROM dbo.Table`
- All system database and tables must be in lower case for properly working in Case Sensitive instance
- Use `TOP` function with brackets because `TOP` has supports use of an expression, such as `(@Rows*2)`, or a subquery: `SELECT TOP(100) LastName …`. More details [here](https://www.red-gate.com/hub/product-learning/sql-prompt/sql-prompt-code-analysis-avoiding-old-style-top-clause). Also `TOP` without brackets does not work with `UPDATE` and `DELETE` statements.
- For demo queries use TOP(100) or lower value because SQL Server SQL Server uses one sorting method for TOP 1-100 rows, and a different one for 101+ rows
More details [here](https://www.brentozar.com/archive/2017/09/much-can-one-row-change-query-plan-part-2/)
- Keywords and data types declaration should be in **UPPERCASE**
- `FROM, WHERE, INTO, JOIN, GROUP BY, ORDER BY` expressions should be aligned so, that all their arguments are placed under each other (see Example below)
- All objects must used with schema names but without database and server name: `FROM dbo.Table`
- All system database and tables must be in lower case for properly working in Case Sensitive instance
Example: