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1 lip 2016 · SELECT * FROM Members WHERE Phone= @Phone; SELECT * FROM Members WHERE Phone= dbo.FormatPhone(@Phone); SELECT * FROM Members WHERE dbo.FormatPhone(Phone)=@Phone; First query is guaranteed optimal, will seek the phone on the index. Second query depends on the characteristics of the dbo.FormatPhone.
11 lip 2024 · In SQL, the WHERE clause filters data based on defined conditions. Read on to follow 20 WHERE practice exercises with beginner-friendly explanations and solutions. This article will review some of our SQL WHERE exercises.
To filter data by multiple conditions in a WHERE clause, use the AND operator to connect the conditions. Here’s what this looks like for two conditions: WHERE condition1 AND condition2. In our example, condition1 is dept = 'Finance' and condition2 is salary > 4000.
The MySQL WHERE Clause. The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition. WHERE Syntax. SELECT column1, column2, ... FROM table_name. WHERE condition; Note: The WHERE clause is not only used in . SELECT statements, it is also used in UPDATE, DELETE, etc.! Demo Database.
The WHERE clause allows you to specify a search condition for the rows returned by a query. The following shows the syntax of the WHERE clause: SELECT . select_list. FROM . table_name. WHERE . search_condition; Code language: SQL (Structured Query Language) (sql)
Table of Contents. 14.1 Built-In Function and Operator Reference. 14.2 Loadable Function Reference. 14.3 Type Conversion in Expression Evaluation. 14.4 Operators. 14.4.1 Operator Precedence. 14.4.2 Comparison Functions and Operators. 14.4.3 Logical Operators. 14.4.4 Assignment Operators. 14.5 Flow Control Functions.
9 lis 2021 · This article covers how to use the SQL WHERE clause in detail, with practical examples using sample data sets.
