Posts (page 125)
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5 min readTo call a stored procedure of Oracle using C#, you can use the OracleCommand class from the Oracle Data Provider for .NET (ODP.NET) library.First, create a connection to the Oracle database using the OracleConnection class and open the connection. Then, create an OracleCommand object and set the CommandType property to StoredProcedure.Next, set the CommandText property to the name of the stored procedure you want to call.
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4 min readTo remove XML attributes in PostgreSQL, you can use the xpath function in combination with the xmlquery function. First, select the XML column from your table and use the xmlquery function to extract the element without the attribute. Then, update the column with the new XML data.
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5 min readTo find specific values in a table in Oracle, you can use a SELECT statement with a WHERE clause. The WHERE clause allows you to specify the conditions that the rows must meet in order to be retrieved.
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2 min readIn PostgreSQL, to return randomly multiple rows from a table, you can use the ORDER BY random() clause in your query. By sorting the rows randomly and limiting the number of rows returned, you can achieve the desired result. Here is an example query:SELECT * FROM your_table ORDER BY random() LIMIT n;Replace your_table with the name of your table and n with the number of rows you want to retrieve. This query will return n randomly selected rows from the table.
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4 min readTo create a user in Oracle 12c, you can use the CREATE USER statement. First, connect to the Oracle Database using SQL*Plus or another SQL client. Then, execute the CREATE USER command followed by the username and password for the new user. You can also assign specific privileges, roles, and quotas to the user during creation. Make sure to have the necessary permissions to create users in the database.
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3 min readUNO is a new database architecture available in Oracle Database 21c, which focuses on simplifying database management by providing a single deployment option. On the other hand, DUAL is a standard table in Oracle databases that serves as a virtual table with a single row and single column, typically used for performing calculations or querying system functions.
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4 min readTo coalesce two columns with a default value of 0 in PostgreSQL, you can use the COALESCE function. This function returns the first non-null value from a list of arguments.You can achieve this by using the COALESCE function with the two columns as arguments, and specifying 0 as the default value.
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5 min readIn Oracle, the equivalent of the object_name() function would be the USER_OBJECTS view. This view provides information about objects owned by the current user, including tables, views, procedures, functions, packages, and more. By querying the USER_OBJECTS view, you can retrieve the names of all the objects owned by the current user.[rating:dc3bb8f1-bf14-46f8-a39b-16fc925c6a8c]How to check the availability of object_name() in Oracle.
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6 min readIn PostgreSQL, you can save temporary session variables by using the SET command. These variables are only available for the duration of the current session and will be automatically reset once the session ends.
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4 min readYou can display the number of "missing" hours in Oracle by using a SQL query that calculates the difference between the total hours in a day and the sum of hours recorded in a table. This can be achieved by using aggregate functions such as SUM and GROUP BY to calculate the total hours recorded for each day, and then subtracting this value from the total number of hours in a day (usually 24). The result will be the number of hours that are "missing" or not recorded in the table.
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3 min readTo create a helper function for queries in PostgreSQL, you can define a new function using the CREATE FUNCTION statement. Inside the function, you can write the custom logic that you want to use for querying the database.You can pass parameters to the function to customize the query based on different conditions. This can make your helper function more versatile and reusable for different scenarios.
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5 min readThe "is" keyword in Oracle procedures is used as a delimiter to separate the parameters and the local variables within the procedure definition. It is not necessary for the functionality of the procedure, but helps in improving the readability and organization of the code. By using "is", developers can clearly distinguish between the parameters that are being passed into the procedure and the variables that are used within the procedure's body.