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...
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 ...
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...
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...
SELECT FROM scarr FIELDS * INTO TABLE @DATA(result). Alternative 2 ... join Effect Specifies a join expression that joins multiple data sources with one another. Example Specifies the database tables SCARR and SPFLI in a join expression. ...
Copy From Two Tables to One We can also copy records from two different tables to a new table using theJOINclause withSELECT INTO. For example, -- copy rows from Customers and Orders tablesSELECTCustomers.customer_id, Customers.first_name, Orders.amountINTOCustomerOrdersFROMCustomersJOINOrdersONCu...
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 ...
Re: Select from two tables performance laptop alias November 14, 2011 01:15PM Re: Select from two tables performance Rick James November 16, 2011 10:40AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright...