In these cases sometime the Moderator need to use this option of self proposing. These need that option of self proposing as well, in some extreme cases. In short, it will be complex to selectively give the option to self proposing, and I am pretty sure the developing team will not do it There is no other Moderator that can go inside and propose answers, or mark my responses as answer.
By the way, I think that if someone could help closing thread in the Hebrew forums, then I could double my point I moderate several forums there and support in others ,and I really appreciate the time you took to explain it.
It all makes sense now. I will definitely follow these guidelines. Thanks for the replies. I remoted into the server that contains the databases. I copied the PDF file from my personal computer desktop to the remote server desktop the path is the same. Operating system error code 5 Access is denied. Like the documentation says here.
No he is not :- I do not think I've ever seen him in the Hebrew forums, unfortunately. Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. A view is a tailored table that is formed as a result of a query. It has tables and rows just like any other table. A user-defined table is a representation of defined information in a table, and they can be used as arguments for procedures or user-defined functions.
A primary key uniquely identifies all values within a table. Foreign keys link one table to another — they are attributes in one table which refer to the primary key of another table. The list of defined triggers can be viewed using the following query. Internal tables are formed as a by-product of a user-action and are usually not accessible. The data in internal tables cannot be manipulated; however, the metadata of the internal tables can be viewed using the following query.
A stored procedure is a group of SQL queries that logically form a single unit and perform a particular task. Thus, using the following query you can keep track of them:.
In this and subsequent examples, we will use a common company database including several tables which are easily visualized. Our practice DB will include a Customers table and an Order table. With this in mind, we can easily imagine an Orders table which likewise contains the indexed customer ID field, along with details of each order placed by the customer. In our first one of SQL examples , imagine a situation where the zip and phone fields were transposed and all the phone numbers were erroneously entered into the zip code field.
We can easily fix this problem with the following SQL statement:. Now, suppose that our data entry operator added the same Customers to the Customers table more than once by mistake. As you know, proper indexing requires that the key field contain only unique values. Next, imagine that our Customers table has grown to include thousands of records, but we just want to show a sample of 25 of these records to demonstrate the column headings and The SELECT TOP clause allows us to specify the number of records to return, like a Top list.
In this example we will return the top 25 from our Customers table:. Today is Wednesday, and we arrive at work and discover that our new data entry clerk in training has entered all new orders incorrectly on Monday and Tuesday. We wish to teach our new trainee to find and correct all erroneous records. The Between clause makes the task a breeze:. Undoubtedly the whole reason that a relational database exists in the first place is to find matching records in two tables!
Here we are going to fetch a list of all records which have matches in the Customers and Orders tables:. Here is a quick way to accomplish the task:. Aliasing column labels give us the convenience of renaming a column label to something more readable. There is a tradeoff when naming columns to make them succinct results in reduced readability in subsequent daily use.
In our Orders table, the item column contains the description of purchased products. In the following example, we will return records from the Orders table where the idea is to get a list of high volume orders for a given item, in this case for customers who ordered more than 50 of the product:.
Here we can simply add the comment delimiter to deactivate it momentarily:. So far we have explored SQL query commands for querying tables and combining records from multiple queries. Here, we are going to create the DB as a container for our Customers and Orders tables used in the previous ten examples above:.
For production purposes, these tips may be crucial to adequate performance. Have a look at this query with a subquery condition:. There are a hundred and one uses for this SQL tool. Suppose you want to archive your yearly Orders table into a larger archive table. This next example shows how to do it. As an example, this next query fetches a list of customers by the region where there is at least one customer per region:. Substring is probably the most valuable of all built-in functions.
Suppose you want to find the substring left of the dots in a web address. John L. Viescas and Michael J. Hernandez are the guys behind this book. Viescas is an independent database consultant with more than 45 years of experience.
He began his career as a systems analyst, designing large database applications for IBM mainframe systems. Michael J. Hernandez has been an independent relational database consultant specializing in relational database design. He has more than 20 years of experience in the technology industry, developing database applications for a wide variety of clients. In this book, both of these authors shared their vast experience and told some techniques about database management.
It offers an excellent introduction to writing SQL queries in a database-neutral way. It uses clear, methodical, and very approachable and easy to understand SQL programming and database handling. The book offers a downloadable set of companion sample databases which are an invaluable learning tool. Each chapter builds on the last and uses multiple examples to illustrate the key points of that chapter. Overall, it is a great book on SQL and database management and we highly recommend it to all newbie and advanced database developers.
Download full-text PDF. This is perhaps the most widely used SQL query. If you want to display all the attributes from a particular table, this is the right query to use: 3.
Query for Creating a View A view is a tailored table that is formed as a result of a query. Query for Retrieving a View The standard syntax of selecting attributes from a table is applicable to views as well. Query to Display User Tables A user-defined table is a representation of defined information in a table, and they can be used as arguments for procedures or user-defined functions.
Query to Display Primary Keys A primary key uniquely identifies all values within a table. Displaying Foreign Keys Foreign keys link one table to another — they are attributes in one table which refer to the primary key of another table. Displaying Internal Tables Internal tables are formed as a by-product of a user-action and are usually not accessible. Displaying a List of Procedures A stored procedure is a group of SQL queries that logically form a single unit and perform a particular task.
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