SELECT * (for simplicity) FROM friends,activity_users WHERE friends.usr_id='$usr_id' AND friends.friend_id=activity_users.usr_id ORDER BY act_date DESC LIMIT 10 > WHERE friends.usr_id='$usr_id' Needs INDEX(user_id) -- Note: If you have PRIMARY KEY(user_id), do not add a ...
If you select rows from two tables (employees and departments) using an outer join, what will you get? Use the code below to arrive at your answer: SELECT e.last_name, e.department_id, d.department_name FROM employees e LEFT OUTER JOIN departments d A. All employees that do not have...
1. To create a relationship between two tables, you need at least a data type. query. hyperlink. primary key. 2. Which of the following does NOT describe a many-to-many relationship? There must be a Explain how to create a Foreign Key in...
Create table from stored procedure Create table help Create Table with current date as part of the table name Create Table with variable name Create temp table and insert records in a while loop Create trigger based on two tables Create trigger does not work inside if statement CREATE TRIGGER ...
join(select*fromhobbiesorderbyHobbie) h 21 onp.PersonId= h.PersonId 22 groupbyp.PersonId 23 ) t1 24 join( 25 selectp.PersonId, 26 count(h.Hobbie) cnt, 27 GROUP_CONCAT(h.HobbieSEPARATOR',') hobbies 28 fromperson p 29 join(select*fromhobbiesorderbyHobbie) h ...
Is a shorthand for aUSINGlist that mentions all columns in the two tables that have the same names. from item Specifies the name of the query source object connected. WHERE clause Forms an expression for row selection to narrow down the query range ofSELECT.conditionindicates any expression tha...
D. Create tables with SELECT INTO The following first example creates a temporary table named#Bicyclesintempdb. SQL USEtempdb; GO IF OBJECT_ID(N'#Bicycles', N'U') IS NOT NULLDROPTABLE#Bicycles; GOSELECT*INTO#BicyclesFROMAdventureWorks2022.Production.ProductWHEREProductNumberLIKE'BK%'; GO ...
As a bit of a sidebar, this uses 31% fewer reads, which will come in handy for when the cross joined tables are larger... WITH cteProduct AS (SELECT ProductID = ID FROM #Product) ,cteUser AS (SELECT DISTINCT UserName = username FROM #product_user) ...
Qualify column_name to prevent an ambiguous reference, such as occurs when two tables in the FROM clause have columns with duplicate names. For example, the SalesOrderHeader and SalesOrderDetail tables in the AdventureWorks2022 database both have a column named ModifiedDate. If the two tables are...
I need to join data from two tables but without using left join statement. Ex: select t1.*,t2.* from t1,t2 where t1.id=t2.id; The above statement shows only matched records from both tables. BUT I need to select ALL records from t1 and matched records from t2. ...