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25-Mar-2019 00:05

sql updating a table from another table-38

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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.

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.

But since the UPDATE has no WHERE clause, it will update all rows, even those where the subquery returns NULL.

Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.

When I try to update only the missing data the non-matched data is also updated but to NULL. The reason some of your rows are getting NULLs updated is due to the subquery.

When the subquery fails to find a matching row in tbl B, the subquery returns NULL.

I have a SQL query where I am trying to update a column in a table (tbl A) from data in another table (tbl B).

This works fine when I try to update all the records in tbl A, however, in this case I only have missing data which I have identified and populated in tbl B.

A view with an INSTEAD OF UPDATE trigger cannot be a target of an UPDATE with a FROM clause. Table2 (d1 int PRIMARY KEY NOT NULL, d2 int NOT NULL); GO INSERT INTO dbo. Table2 VALUES (1, 20), (2, 30); GO DECLARE abc CURSOR LOCAL FOR SELECT c1, c2 FROM dbo. Table1; GO Support for use of the READUNCOMMITTED and NOLOCK hints in the FROM clause that apply to the target table of an UPDATE or DELETE statement will be removed in a future version of SQL Server.Now what happens if you want to update rows in one table based on the condition of another table?This question leads to a few different ways you could do this.Note Any call to OPENDATASOURCE, OPENQUERY, or OPENROWSET in the FROM clause is evaluated separately and independently from any call to these functions used as the target of the update, even if identical arguments are supplied to the two calls. Avoid using these hints in this context in new development work, and plan to modify applications that currently use them.

In particular, filter or join conditions applied on the result of one of those calls have no effect on the results of the other. Table2; USE Adventure Works2012; GO IF OBJECT_ID ('dbo. All char and nchar columns are right-padded to the defined length.Common table expressions can also be used with the SELECT, INSERT, DELETE, and CREATE VIEW statements.