Posts (page 19)
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3 min readTo return the ID after inserting into Oracle, you can use the RETURNING clause in your SQL insert statement. This clause allows you to retrieve the value of the ID column immediately after inserting a new row into the database.
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4 min readTo parse XML data from a CLOB in Oracle, you can use the XMLType constructor to convert the CLOB into an XMLType object. Once you have the XMLType object, you can then use XML functions and methods to extract and manipulate the data within the XML document. For example, you can use XPath expressions to navigate the XML structure and retrieve specific elements or attributes. Additionally, you can use XMLQuery or XMLTable to extract data from the XML document and store it in a relational format.
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3 min readTo create an XML from an Oracle command in C#, you can use the OracleDataReader class to read the data from the Oracle database and then use XmlTextWriter class to write the data to an XML file.First, establish a connection to the Oracle database using the OracleConnection class and create an OracleCommand object with the SQL query that retrieves the data you want to convert to XML. Execute the command using the ExecuteReader method to get the data in a reader object.
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4 min readTo get the maximum value of a column in Oracle SQL, you can use the MAX() function along with the SELECT statement. Simply write a query that selects the MAX() value of the desired column from the specified table. This will return the highest value present in that column. You can also use the WHERE clause to filter the results based on certain conditions, if needed.
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7 min readTo get data from an Oracle SQL dump file, you can use the Oracle Data Pump utility. This utility allows you to import data from a dump file into your Oracle database. You can use the impdp command to import data from the dump file.First, you will need to have access to an Oracle database and have the necessary privileges to import data. You will also need the dump file that contains the data you want to import.
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5 min readTo get the Tomcat session attribute from Oracle, you can use a combination of Java code and Oracle database queries. You can start by retrieving the session ID of the user from the Tomcat session. Once you have the session ID, you can query the Oracle database to find the corresponding session attribute. This can be done by querying the Oracle database table that stores session attributes. By matching the session ID with the attribute in the database, you can retrieve the desired attribute.
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4 min readTo display the birth year in Oracle, you can extract the year component from a date using the TO_CHAR function with the 'YYYY' format. For example, if your birthdate column is called "birthdate" in a table called "people", you can write a query like:SELECT TO_CHAR(birthdate, 'YYYY') AS birth_year FROM people;This will display the birth year as a separate column in the result set.
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3 min readTo spool query results in Oracle, you can use the spool command. First, open SQLPlus and connect to your Oracle database. Then, type "spool file_path/file_name.txt" to specify the file path and name where you want to save the query results. Next, run your query as you normally would. The query results will now be spooled to the file you designated. To stop spooling, simply type "spool off" in SQLPlus.
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6 min readTo return an Oracle table in a procedure, you can use a cursor. The cursor will fetch the data from the table and return it as a result set.Here is an example of how to create a procedure that returns a table in Oracle:Create a cursor that selects the data from the table you want to return.Define a type that represents the structure of the data in the table.Declare a record variable of the type created in step 2.Open the cursor and fetch the data into the record variable.Close the cursor.
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6 min readTo create a foreign key in Oracle, you need to first have a primary key in the parent table that you want to reference. Then, you can use the ALTER TABLE statement to add a foreign key constraint to the child table.
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4 min readTo get the Oracle database version, you can run a SQL query using the SQL*Plus tool or any other Oracle SQL query tool. Connect to the Oracle database using the appropriate credentials and then execute the following SQL query:SELECT * FROM V$VERSION;This query will return the version of the Oracle database that you are connected to. The output will include information such as the Oracle version, release number, and other details about the database version.
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4 min readTo filter null values in Oracle SQL, you can use the IS NULL operator in your query. This operator allows you to check if a column has a null value. For example, to filter out records where the column "column_name" contains a null value, you can use the following query:SELECT * FROM table_name WHERE column_name IS NULL;This query will retrieve all records from the table where the "column_name" column contains a null value.