Posts (page 54)
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4 min readTo insert a Blob into an Oracle table via SQL, you can use the INSERT statement along with the empty_blob() function to create an empty Blob object in the table. Then, you can use the DBMS_LOB package to write data to the Blob object. First, create a new row in the table using the INSERT statement and the empty_blob() function to insert an empty Blob object. Next, select the empty Blob object into a variable.
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6 min readTo use Entity Framework with an Oracle database, you need to first install the Oracle Data Access Components (ODAC) or Oracle Developer Tools for Visual Studio. These tools provide the necessary libraries and drivers for Entity Framework to communicate with the Oracle database.Once you have installed the necessary tools, you can then create a new Entity Data Model in your Visual Studio project and choose the option for "Code First from Database".
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6 min readRounding in Oracle database can be prevented by being cautious while performing mathematical operations on numeric datatypes. It is important to understand the precision and scale of the numeric data being used in calculations and to ensure that the calculation result fits within the defined precision and scale.One way to prevent rounding in Oracle database is to use the appropriate data types with sufficient precision and scale for your calculations.
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6 min readTo update a JSON property of a timestamp in Oracle, you can use the JSON_QUERY() and JSON_VALUE() functions to extract and update the timestamp property within the JSON column. First, you can extract the timestamp property using JSON_QUERY() to get the value, and then update it using JSON_VALUE() to set the new value. Make sure to use proper JSON path expressions to target the timestamp property within the JSON column.
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3 min readTo check the time format in Oracle, you can use the TO_TIMESTAMP function to convert a string to a timestamp datatype. If the string does not match the expected time format, an error will be returned. You can also use the TO_DATE function to convert a string to a date datatype and specify the expected time format. Additionally, you can use the REGEXP_LIKE function with a regular expression pattern to check if a string matches a specific time format.
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4 min readTo schedule a one time executable job in Oracle, you can use the DBMS_SCHEDULER package. First, create a new job using the CREATE_JOB procedure with the desired job name, job type, and parameters. Next, set the start time of the job using the SET_ATTRIBUTE procedure with the start_date parameter. Finally, use the ENABLE procedure to activate the job. Once the job has been scheduled, it will run at the specified start time as a one-time execution.
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3 min readIn wxPython, you can use two frames together by creating instances of both frames and then showing them as needed. You can create a main frame and a secondary frame, and then display them side by side or one on top of the other. You can also pass data between the frames by using event handling or attributes of the frame instances.
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6 min readIn Oracle, you can parse JSON data using the JSON_VALUE, JSON_QUERY, and JSON_TABLE functions. JSON_VALUE is used to extract a scalar value from a JSON document, while JSON_QUERY is used to extract a JSON object or array. JSON_TABLE is used to extract data from a JSON document and convert it into relational format. You can also use the JSON_EXISTS function to check if a specified path exists in a JSON document.
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3 min readYou can find full duplicate rows in Oracle by using the following SQL query:SELECT * FROM your_table WHERE ROWID NOT IN (SELECT MIN(ROWID) FROM your_table GROUP BY column1, column2, ...);This query will return all rows that have duplicate values across all columns in the specified table. The ROWID function is used to identify which rows are duplicates, and the MIN function is used to find the minimum ROWID for each group of duplicate rows.
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3 min readTo increase a date by 1 month in Oracle SQL, you can use the ADD_MONTHS function. This function allows you to add a specified number of months to a given date.
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6 min readTo get parent child relationships with auto skip in SQL Oracle, you can use a recursive query. This can be achieved by using the CONNECT BY clause with PRIOR keyword to establish the parent-child relationships. You can also use the LEVEL pseudocolumn to filter out the desired depth of the hierarchy.
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2 min readTo use the greatest function with over partition by in Oracle, you can simply include the partition by clause after the over clause in your query. This allows you to calculate the greatest value within each partition specified in the partition by clause. The greatest function will then return the maximum value within each partition, rather than the overall maximum value across the entire dataset. This can be useful for analyzing data within distinct groups or categories.