Sql updating multiple rows from another table

Drop me an email and I will promptly and gladly rectify it.MS SQL Server, a Relational Database Management System (RDBMS), is used for storing and retrieving data.Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.We are going to update column DESCRIPTION and PICTURE in table Categories_Test by using data in table Categories, based on data in the common column CATEGORY_ID. Update data in a column in table A based on a common column in table B. Update data in two columns in table A based on a common column in table B. Conditionally update data in table A based on a common column in table B. No portion may be reproduced without my written permission.Purchase Order Detail AFTER INSERT AS UPDATE Purchase Order Header SET Sub Total = Sub Total Line Total FROM inserted WHERE Purchase Order Header. Purchase Order ID ; -- Trigger is valid for multirow and single-row inserts.USE Adventure Works2012; GO CREATE TRIGGER New PODetail2 ON Purchasing. Population Data state Population ----------------------------------------------- Texas 20,851,820 Georgia 8,186,453 Washington 5,894,121 Arizona 5,130,632 Alabama 4,447,100 Oklahoma 3,450,654 Connecticut 3,405,565 Iowa 2,926,324 West Virginia 1,808,344 Idaho 1,293,953 Maine 1,274,923 New Hampshire 1,235,786 North Dakota 642,200 Alaska 626,932 proc sql; title 'UNITEDSTATES'; update sql.unitedstates as u set population=(select population from sql.newpop as n where u.name=n.state) where in (select state from sql.newpop); select Name format=., Capital format=., Population, Area, Continent format=., Statehood format=date9. UNITEDSTATES table, the in-line view in the SET clause returns a single value. NEWPOP, this value is the value of the Population column from SQL. For rows that do not have a corresponding row in SQL. In both cases, the returned value is assigned to the Population column.

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from sql.unitedstates; 114000 North America 14FEB1912 Arkansas Little Rock 2447996 53200 North America 15JUN1836 California Sacramento 31518948 163700 North America 09SEP1850 Colorado Denver 3601298 104100 North America 01AUG1876 Connecticut Hartford 5500 North America 09JAN1788 Delaware Dover 707232 2500 North America 07DEC1787 District of Colum Washington 612907 100 North America 21FEB1871 Florida Tallahassee 13814408 65800 North America 03MAR1845 The UPDATE statement updates values in the SQL. The WHERE clause ensures that only the rows in SQL. NEWPOP are updated, by checking each value of Name against the list of state names that is returned from the in-line view.

When you write the code for a DML trigger, consider that the statement that causes the trigger to fire can be a single statement that affects multiple rows of data, instead of a single row.

This behavior is common for UPDATE and DELETE triggers because these statements frequently affect multiple rows.

The first version of the DML trigger works well for a single-row insert when a row of data is loaded into the -- Trigger is valid for single-row inserts.

USE Adventure Works2012; GO CREATE TRIGGER New PODetail ON Purchasing.

A sample dataset containing information about movies and its user ratings is used in this use case.

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