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6 min readTo call a particular stored procedure in Oracle, you can use the following syntax:Start by opening the SQL*Plus application or any other Oracle client tool.Connect to your Oracle database using the appropriate credentials.Once connected, you can call the stored procedure using the EXECUTE or EXEC command, followed by the stored procedure name and any required parameters.
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3 min readTo get the sum of rows in Oracle, you can use the SUM() function along with the GROUP BY clause. Here is an example:Consider we have a table named "sales" with two columns: "product" and "quantity".To find the sum of quantities for each product, you can use the following query:SELECT product, SUM(quantity) FROM sales GROUP BY product;This query will return a result set showing the product name along with the total sum of quantities for each product.
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8 min readTo make a ranking of values in Oracle, you can use the RANK() or DENSE_RANK() functions. These functions assign a unique ranking to each value based on a specified order.To use the RANK() function, you can follow this syntax: SELECT column1, RANK() OVER (ORDER BY column1) AS ranking FROM table_name;In this example, replace "column1" with the column you want to rank, and "table_name" with the actual name of the table you are working with.
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8 min readTo copy one column of data into another column in Oracle, you can use the UPDATE statement. Here's the procedure:Start by opening a SQL command line or any Oracle client tool.Identify the table name where you want to copy the data within columns.Construct an UPDATE statement that sets the data in the destination column equal to the data in the source column.
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5 min readTo execute a query stored in a variable in Oracle, you can make use of the EXECUTE IMMEDIATE statement. It allows you to execute a dynamic SQL statement or a PL/SQL block of code stored in a variable.
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5 min readTo create a subset of an Oracle cursor, you can follow these steps:Declare a cursor: Define a cursor variable or cursor with a SELECT statement. For example: CURSOR cursor_name IS SELECT column1, column2, ... FROM table_name; Declare an empty collection: Define a collection based on a table structure that matches the columns selected in the cursor.
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8 min readTo connect to an Oracle database from Unix, you can follow these general steps:First, ensure that you have the necessary Oracle client software installed on your Unix machine. The client software provides the required libraries and utilities to connect to an Oracle database.Next, open a terminal or shell on your Unix system.Set the necessary environment variables. Typically, you need to set the ORACLE_HOME variable to the installation directory of the Oracle client software.
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5 min readIn Oracle, you can convert a date in the format "yyyymmdd" to "dd-mon-yyyy" by utilizing the TO_DATE and TO_CHAR functions.Here's the syntax you can use:TO_CHAR(TO_DATE(date_string, 'yyyymmdd'), 'dd-mon-yyyy')Explanation of the syntax:The TO_DATE function is used to convert the date string into a proper date format. It takes two arguments: the date string and the format specifier ('yyyymmdd' in this case).
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5 min readTo call an Oracle function in a package using C#, you can follow these steps:Create a new OracleConnection object and provide the necessary connection string to connect to the Oracle database. Open the connection using the Open() method of the OracleConnection object. Create an OracleCommand object and set its Connection property to the OracleConnection object created in the previous step. Set the CommandType property of the OracleCommand object to CommandType.
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10 min readTo get rid of Oracle archive (.arc) files, you can follow these steps:Connect to the Oracle database using a client tool or software like SQL*Plus. Check the current location of the archive files by running the following query: SELECT name FROM v$archived_log; This will display the list of archived log files and their paths. Determine the retention policy for archived log files using the following query: SHOW PARAMETER log_archive_dest_1; Note down the value of the "RETENTION" parameter.
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8 min readMaintaining order with distinct groups in Oracle can be achieved using various techniques. Here are some commonly used methods:Using the DISTINCT keyword: The DISTINCT keyword in an SQL query allows you to retrieve only unique values from a query result. By incorporating the DISTINCT keyword along with the ORDER BY clause in your query, you can maintain order within distinct groups.