Sql updating multiple columns
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.
The update query below shows that the PICTURE column is updated by looking up the same ID value in CATEGORY_ID column in table Categories_Test and Categories. If you need to update multiple columns simultaneously, use comma to separate each column after the SET keyword. Here we only want to update PICTURE column in Categories_Test table where the data in Category_Name column is Seafood in table Categories. Software and hardware names mentioned on this site are registered trademarks of their respective companies.
TOP ( ) Specifies one or more table hints that are allowed for a target table. @ When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter ' N'.
If ' N' is not specified, SQL Server converts the string to the code page that corresponds to the default collation of the database or column.
In this article, we are going to look at four scenarios for Oracle cross table update. Category_ID) where exists ( select * from Categories b where b. These columns uniquely identify a record in a table.
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.
The syntax for updating a single column is as follows: In this case, there is only one row that satisfies the condition in the WHERE clause.
If there are multiple rows that satisfy the condition, all of them will be modified.
Every major database system, whether proprietary or open source, has a manual which you can browse for free on the Web.
If no WHERE clause is specified, all rows will be modified.
We notice that the 'San Diego' entry has the wrong Sales and TXN_Date information. Using the same Store_Information table right above, what data is in the table after the following SQL statement is executed?
Specifies the temporary named result set or view, also known as common table expression (CTE), defined within the scope of the UPDATE statement.
The CTE result set is derived from a simple query and is referenced by UPDATE statement.
To fix it, we run the following SQL statement: IMPORTANT: When using the UPDATE statement, pay special attention to make sure that some type of filtering criteria is specified. UPDATE Store_Information SET Sales = 800 WHERE Store_Name = 'Boston'; 2. What is the content of the table after the following SQL statement is executed?