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How to use SQL Developer to run SQL statements. Chapter 2, How to use Oracle SQL Developer and other tools By submitting your personal information, you agree that Tech.
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Learn how to use SQL Developer to run multiple SQL statements, work with a Snippets window, solve common syntax errors and more in this chapter.
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This chapter from Murach's Oracle SQL and PL/SQL explains how to work with Oracle SQL Developer and other tools. In this section, learn how to use SQL Developer to enter and execute SQL statements and scripts, work with a Snippets window, solve common syntax errors and more. TABLE OF CONTENTSBesides letting you review the design of a database, SQL Developer is a great tool for entering and running SQL statements. That's what you'll learn how to do next. How to enter and execute a SQL statement.
Figure 2- 8 shows how to use the SQL Worksheet window to enter and execute a SQL statement. The easiest way to open a SQL Worksheet window is to use the drop- down list that's available from the Open SQL Worksheet button on the toolbar. First, you can click on the arrow to the right of this button to display all connections.
Then, you can select the connection you want to use. This opens a Worksheet for that connection. But first, if the connection hasn't been used in the current session, you may be prompted to enter the password for the connection. Once you open a SQL Worksheet, you can use standard techniques to enter or edit a SQL statement. As you enter statements, you'll notice that SQL Developer automatically applies colors to various elements.
For example, keywords are displayed in blue. This makes your statements easier to read and understand and can help you identify coding errors. When you enter SQL statements, you'll notice that SQL Developer automatically displays a drop- down list that helps you enter SQL statements. This feature often provides help for entering SQL keywords, table names, column names, and so on. In this figure, for example, SQL Developer displayed a dropdown list after I entered the ORDER BY keywords and pressed the spacebar.
At this point, you can easily select a column name from the drop- down list. If you experiment with this code completion feature, you'll find that SQL Developer doesn't display column names automatically until you enter the name of the table that's used by the statement.
As a result, if you want to use the code completion feature, you may want to enter the table name before you enter the column names. Most of the time, SQL Developer automatically displays the drop- down list after you enter some code followed by a space.
Usually, that's what you want. However, there are times when you may want to manually prompt SQL Developer to display the drop- down list. To do that, you can press the Ctrl key and the spacebar at the same time (Ctrl+spacebar).
In addition, you can use SQL Developer to automatically comment or uncomment a line. To do that, you can move the insertion point into the line.
Then, you can press Ctrl key and the front slash at the same time (Ctrl+/). To execute a single SQL statement like the one in this figure, you can press F9 or click the Execute Statement button in the toolbar for the SQL Worksheet window. If the statement returns data, that data is displayed in the Results tab. In this figure, for example, the result set returned by the SELECT statement is displayed.
If necessary, you can adjust the height of the Results pane by dragging the bar that separates the SQL Worksheet window from the Results tab. A SELECT statement and its results Figure 2- 8 How to enter and execute a SQL statement. Description. To open a new SQL Worksheet window, drop down the list from the Open SQL Worksheet button. Then, select the connection you want to use. To change the connection for the worksheet, use the Connections list.
To enter a SQL statement, type it into the SQL Worksheet window. As you enter the text for a statement, the SQL Worksheet window applies color to various elements, such as SQL keywords, to make them easy to identify. As you enter the text for a statement, you can use the code completion feature to select SQL keywords, table names, column names, and so on. To manually display the code completion list, press Ctrl+spacebar.
To comment out a line or to uncomment a line, press Ctrl+/. To execute a SQL statement, press the F9 key or click the Execute Statement button in the toolbar. If the statement retrieves data, the data is displayed in the Results tab of the SQL Worksheet window. How to work with the Snippets window. Figure 2- 9 shows how to use the Snippets window to enter a snippet of code into the SQL Worksheet window.
To start, if the Snippets tab isn't displayed on the right side of the SQL Developer window, you can select the Snippets command from the View menu to display the Snippets window. Otherwise, you can display the Snippets window by clicking on the Snippets tab that's displayed on the right side of the SQL Developer window.
Then, you can use the drop- down list at the top of the Snippets window to select a category of snippets, and you can drag a snippet from the Snippets window into the SQL Worksheet window. At that point, you can edit the snippet code so it's appropriate for your SQL statement. In this figure, for example, I dragged the COUNT(*) and SUM(expr) snippets into the SQL Worksheet window. Then, I edited the SUM(expr) snippet to replace the expr placeholder with a valid expression. For now, don't worry if you don't understand the SQL statement presented in this figure.
The main point is that you can use the Snippets window to enter a variety of SQL code. As you learn more about SQL statements, you'll see how useful this can be. How to use the Snippets window Figure 2- 9 How to use the Snippets window. Description. If the Snippets tab isn't displayed on the right side of the SQL Developer window, you can display it by selecting the Snippets command from the View menu. To display the Snippets window, click on the Snippets tab that's displayed on the right side of the SQL Developer window.
To display another category of snippets, select the category from the drop- down list at the top of the Snippets window. The snippets are organized in 1. Date Formats, Number Formats, Date/Time Functions, Number Functions, Character Functions, Conversion Functions, and Pseudocolumns. To enter a snippet into your code, drag the snippet from the Snippets window into the SQL Worksheet window. Then, if necessary, edit the snippet code so it's appropriate for your SQL statement. The Snippets window will become more useful as you learn more about formats and functions. How to handle syntax errors.
If an error occurs during the execution of a SQL statement, SQL Developer displays a dialog box that includes the error number, a brief description of the error, and the location of the error in your code. In figure 2- 1. 0, for example, the dialog box displays an error number of "ORA- 0. This dialog box also indicates that the error occurred at line 2, column 5, where a table or view named Vendor is referenced. In this example, the problem is that the Vendor table doesn't exist in the database.
To fix the problem, you need to edit the SQL statement so the table is Vendors instead of Vendor. Then, you should be able to successfully run the SQL statement. This figure also lists some other common causes of errors. As you can see, most errors are caused by incorrect syntax.
However, it's also possible that you will get an error if you are connected as the wrong user. If, for example, you are connected as the EX user and you try to run a statement that references tables in the AP schema, you may get an error. Regardless of what's causing the problem, you can usually identify and correct the problem without much trouble. In some cases, though, it may be difficult to figure out the cause of an error.