This SQL tutorial explains how to use the SQL SELECT statement with syntax, examples, and practice exercises. The SQL SELECT statement is used to retrieve records from one or more tables in your SQL database.
ThisSELECTstatement retrieves all rows from theorderstable, and any matching rows from thecustomerstable based on thecustomer_idcolumn. If an order does not have a corresponding customer, thecustomerscolumns for that order will contain NULL values. Select from multiple tables with RIGHT JOIN clause...
The UNION statement is another way to return information from multiple tables using a single query. The UNION statement allows you to perform queries against several tables and return the results in a consolidated set, as in the following example: SELECT column1, column2, column3 FROM table1 U...
SQL SELECT from Multiple TablesThis statement is used to retrieve fields from multiple tables. To do so, we need to use join query to get data from multiple tables.Let's see the example for the select from multiple tables:SELECT orders.order_id, suppliers.name FROM suppliers INNER JOIN ...
SELECT * FROM CompanyData.dbo.Customers WHERE CustomerID BETWEEN 3200000 AND 3400000; 该查询的执行计划从本地成员表中提取 CustomerID 键值从 3200000 到 3299999 的行,并发出分布式查询以从 Server2 中检索键值从 3300000 到 3400000 的行。SQL Server 查询处理器还可以在查询执行计划中创建动态逻辑,用于必须生...
The SQL SELECT Statement can fetch columns from many tables at once. For example, SELECT orders.order_id ,suppliers.supplier_name FROM suppliers ,orders WHERE suppliers.supplier_id = orders.supplier_id; The above SQL SELECT Statement joins two database tables namely “Orders” and “Suppliers”...
<SELECT statement>::=[WITH{ [XMLNAMESPACES, ] [<common_table_expression>[ , ...n ] ] } ]<query_expression>[ORDERBY<order_by_expression>] [<FOR Clause>] [OPTION(<query_hint>[ , ...n ] ) ]<query_expression>::={<query_specification>| (<query_expression>) } [ {UNION[ALL] |EX...
Shared (S) Used for read operations that do not change or update data, such as a SELECT statement. Update (U) Used on resources that can be updated. Prevents a common form of deadlock that occurs when multiple sessions are reading, locking, and potentially updating resources later. Exclusive...
SQL SELECT INTO – Insert Data from Multiple Tables In previous examples, we created a table using theSELECT INTOstatement from a single tableEmployee. We can also join multiple tables and use the SELECT INTO statement to create a new table with data as well. In this section, we want to ...
Retrieving Records from Multiple Tables It does no good to put records in a database unless you retrieve them eventually and do something with them. That's the purpose of theSELECTstatement—to help you get at your data.SELECTprobably is used more often than any other in the SQL language,...