Update subquery informix

Improve this question. Zanon Zanon Add a comment. Active Oldest Votes. From the Informix manual : The subquery must be enclosed between parentheses. If the expression list includes multiple subqueries, each subquery must be enclosed between parentheses, with a comma , separating successive subqueries: UPDATE Improve this answer.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The query locates and returns the 16 rows that have the 10 latest shipping dates, as Query Result shows.

Query Result For information about indexing and performance issues, see the Administrator's Guide and your Performance Guide. Query b uses an IN predicate to construct a query that returns the same result as Query a.

Query a and Query b return rows for the manufacturers that produce a kind of shoe as well as the lead time for ordering the product.

Query Result shows the return values. You can also substitute! Query shows two ways to do the same thing. One way might allow the database server to do less work than the other, depending on the design of the database and the size of the tables.

Each statement in Query returns the rows that Query Result shows, which identify customers who have not placed orders. These concepts are discussed in Set Operations. Query performs a subquery on the items table to identify all the items in the stock table that have not yet been ordered.

Query returns the rows that Query Result shows. No logical limit exists to the number of subqueries a SELECT statement can have, but the size of any statement is physically limited when it is considered as a character string. However, this limit is probably larger than any practical statement that you are likely to compose.

If you want to brush up on some subquery concepts, I suggest the course SQL Basics where you can find a complete section on subqueries. This is very common; the idea is to insert the complete result set from a subquery or a SELECT statement into a table. As an example, imagine we want to create invoices for all wine orders we received during the day. Below is a partial view of our invoice table:. If we simply add an INSERT clause before the query, we can insert the result of the query into the table wine , as we can see in the following example:.

We can see this below, with the new records in red:. Suppose that on a particular day, we accidentally ran the INSERT twice, and our customers received two invoices for each order as a result. The subquery added at the end identifies the invoices that already exist, and the outer query discards them by using the NOT IN operator.

We can use a subquery to obtain this new value, which can be selected from any table or any valid subquery, as long as we return only one record with only one column for each record being updated. The data type of the column returned by the subquery must be of the same type as that of the column being modified.

The code will look like this:. We need to fix this. There are two approaches for the fix. The second approach is to add a subquery in the WHERE clause to modify only the wines that were ordered today and maintain the expression SUM quantity as is. The following query shows this approach:.