Figure 4-11 Filter expression error in Visual Studio .NET

Making EAN13 in Visual Studio .NET Figure 4-11 Filter expression error

Figure 4-11 Filter expression error
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in lowercase Unfortunately, I created my column name in mixed case Notice that even though I entered the filter expression correctly, PostgreSQL converted the column name to all lowercase letters, which did not match the real column name To solve this problem, you should always place double quotes around column and table names that use uppercase letters If you use the schemanametablename format, make sure that each one has quotes around each individual name instead of the whole name (for example, "Store""Customer" and not "StoreCustomer") Notice, however, that character strings use single quotes This feature can get confusing, as well as annoying Do not get too hung up on the filter expressions at this point 6 discusses this topic in greater detail
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While the pgAdmin Edit Data window is a handy way to display and enter data, it is not all that sophisticated For more advanced queries to your PostgreSQL system, pgAdmin III includes its own query program The pgAdmin III Query Tool provides an interface for submitting standard SQL statements to your database You access the tool by clicking the notepad-and-pencil icon in the top toolbar or by choosing Tools | Query Tool Before you start the Query Tool, make sure that you have the database you want to query data from selected in the left-side frame of the pgAdmin III window You are only allowed to query tables from one database at a time using the Query Tool The main Query Tool window is shown in Figure 4-12 The toolbar at the top of the Query Tool window shows the database object you are connected to Remember, you can only query tables in the connected database If you are using multiple schemas in your database, you need to reference your tables using the schemanametablename format The main Query Tool window is split into two frames In the top frame you enter SQL commands for the database engine to process In this interface you can enter any valid SQL command (see 6 for SQL commands) and as many SQL commands as you need to process Once you have the SQL commands created, click one of the following three execution buttons in the toolbar to run them: Execute query Execute query and save results to file Explain query The first two are somewhat self-explanatory When the SQL commands are executed, the results are displayed in the lower frame in the Data Output tab If you use the Save Results to File button, an Export Data to File window appears, providing you with options on how you would like the data saved You can select various options for the format the data is stored in, such as what character is used to separate record fields, and the type of quotes used to delineate string values The third option, Explain Query, is somewhat different Instead of running the query, the Query Tool uses the PostgreSQL explain plan The explain plan describes the steps
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Figure 4-12 The pgAdmin III Query Tool main window
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the PostgreSQL database engine takes to process the query, and how long the individual steps would take to process The steps appear as icons in the Explain tab of the lower frame For a simple one-step query, the results are not too interesting You will see just a single icon When you click the icon, a textbox appears, showing the statistics for processing the SQL command For more complicated SQL commands, you see multiple step icons within the Explain tab This feature enables you to determine which steps take the most amount of time when processing the SQL commands, and possibly allow you to alter your commands to be more efficient These will be covered in more detail in 10
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