The SQL SELECT statement is used to select (retrieve) data from a database table. Example -- select first_name from Customers tableSELECTfirst_nameFROMCustomers; Run Code The above SQL query selects thefirst_na
Syntax:SELECT[ALL | DISTINCT | DISTINCTROW][HIGH_PRIORITY][STRAIGHT_JOIN][SQL_SMALL_RESULT][SQL_BIG_RESULT][SQL_BUFFER_RESULT]SQL_NO_CACHE[SQL_CALC_FOUND_ROWS]select_expr[, select_expr ...][FROM table_references [PARTITION partition_list][WHERE where_condition][GROUP BY {col_name | expr ...
SQL USEAdventureWorks2022; GO IF OBJECT_ID('dbo.ProductResults', 'U') IS NOT NULLDROPTABLEdbo.ProductResults; GO IF OBJECT_ID('dbo.Gloves', 'U') IS NOT NULLDROPTABLEdbo.Gloves; GO-- Create Gloves table.SELECTProductModelID,NameINTOdbo.GlovesFROMProduction.ProductModelWHEREProductModelIDIN(...
In SQL, SELECT LIMIT, TOP, and FETCH FIRST are used to select a fixed number of rows from a database. In this tutorial, you will learn about SQL LIMIT, TOP, and FETCH FIRST with the help of examples.
SQL Copy USE AdventureWorks2022; GO SELECT ProductID FROM Sales.SalesOrderDetail GROUP BY ProductID HAVING AVG(OrderQty) > 5 ORDER BY ProductID; GO This query uses the LIKE clause in the HAVING clause. SQL Copy USE AdventureWorks2022; GO SELECT SalesOrderID, CarrierTrackingNumber FROM Sales...
Avoid SQL statements that cannot be pushed down (indicated by REMOTE_XXX_QUERY in the EXPLAIN output). Refrain from frequent COUNT queries on large row-store tables (over 10 million rows). Limit the number of UNION/UNION ALL branches in a single SQL statement to 50, and associate no more...
Just add a WHERE clause that causes the query to return no data:SELECT * INTO newtableFROM oldtableWHERE 1 = 0; Exercise? What is the primary purpose of the SQL SELECT INTO statement? To update data in an existing table To copy data from one table into a new table To delete data ...
In the syntax: Note:Throughout this course, the wordskeyword,clause, andstatementare used as follows: Akeyword(关键字)refers to an individual(独特的)SQL element(有特殊含义的SQL元素) ——for example,SELECTandFROMare keywords. Aclause(子句)is a part of a SQL statement(Select语句的一个组成部分...
The SELECT statement retrieves rows from the database and enables the selection of rows or columns from tables in the SQL Server Database Engine.
What happens ifSQL DISTINCT and TOP are in the Same Query? Finding and Correcting SQL Select Errors Sooner or later you’ll mistype a select statement into the command line and the computer will yell at you —“Syntax Error!” or “Invalid Column Name” What to do? Just remember that the...