Posts - Page 176 (page 176)
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4 min readTo update a column with a date in Oracle, you can use the following SQL query:UPDATE table_name SET column_name = TO_DATE('your_date_here', 'date_format_here') WHERE condition_here;In this query:Replace table_name with the name of the table you want to update.Replace column_name with the name of the column you want to update with a date.Replace your_date_here with the desired date in the format 'YYYY-MM-DD'.
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4 min readTo verify an optimized model in TensorFlow, you can evaluate its performance on a separate validation dataset or test dataset. This involves loading the saved model, loading the validation or test dataset, and then using the model to predict the outputs of the input data. You can compare these predicted outputs with the ground truth labels of the validation or test dataset to see how well the model is performing.
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5 min readTo reset the username and password for an Oracle database, you need to first log in to the Oracle database as a privileged user, such as SYS or SYSTEM. Once logged in, you can use the ALTER USER command to reset the password for a specific user by specifying the new password in the command.To reset the username, you may need to create a new user with the desired username and assign the necessary privileges to this user. You can do this by using the CREATE USER and GRANT commands.
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6 min readTo translate JavaScript promises to Rust, you can use the Rust Future trait. Promises in JavaScript represent the eventual completion or failure of an asynchronous operation, similar to futures in Rust. You can create a future in Rust using the Future trait and implement the necessary methods such as poll, map, and_then, and await to handle the asynchronous operations.
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4 min readTo get a summary of pivot rows in Oracle, you can use the GROUP BY clause along with aggregate functions such as COUNT(), SUM(), AVG(), etc. to calculate summary values for each group of pivot rows. By grouping the pivot rows based on certain criteria, you can generate summary information such as totals, averages, counts, or other statistics for the data in the pivot rows.
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4 min readTo reverse a rust string in-place using recursion, you can create a recursive function that takes a mutable reference to the string and two indices representing the start and end points of the substring to be reversed. Within the function, you can swap the characters at the start and end indices, then recursively call the function with the start index incremented and the end index decremented until the start index is greater than or equal to the end index.
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3 min readTo fetch only uppercase values in Oracle, you can use the UPPER function in your SQL query. The UPPER function converts a string to uppercase, so you can compare the original value with its uppercase version to filter out only the uppercase values. For example, you can use a WHERE clause like this:SELECT column_name FROM table_name WHERE column_name = UPPER(column_name);This query will return only the rows where the column value is in uppercase.
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6 min readTo grayscale an image captured from a camera in Rust, you can use the image crate to read the image, convert it to grayscale, and save the new grayscale image. First, you need to capture the image from the camera using a library like the camera-capture crate. Once you have the image data, you can use the image crate to read the image data, convert it to grayscale using the rgb_image.grayscale() function, and save the new image using the image::io::Reader struct and the save function.
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6 min readTo remove duplicate records in an Oracle query, you can use the DISTINCT keyword in your SELECT statement. This keyword eliminates duplicate rows from the result set based on all selected columns. Alternatively, you can use the ROW_NUMBER() analytical function to assign a unique row number to each row and then filter out duplicate rows by selecting only the rows with row numbers equal to 1.
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5 min readTo match a string against patterns in Oracle SQL, you can use the LIKE operator along with wildcard characters. The percent sign % represents zero or more characters, while the underscore _ represents a single character. For example, to find all values that start with 'ABC', you can use WHERE column_name LIKE 'ABC%'.Another option in Oracle SQL is to use regular expressions with the REGEXP_LIKE function.
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5 min readTo access memory-mapped registers in Rust, you first need to create a struct that represents the memory-mapped register block. This struct should have fields that correspond to the registers within the block. You can use the volatile crate to ensure that read and write operations on the registers are not optimized out by the compiler.Next, you need to define functions or methods on the struct that read from and write to the registers.
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6 min readTo get a user from a db_link using Oracle, you can use the following SQL query:SELECT * FROM user@db_link_name;Replace "user" with the name of the user you want to retrieve and "db_link_name" with the name of the database link established in your Oracle database. This query will allow you to retrieve the user information from the linked database. Make sure the necessary permissions and configurations are in place to access the remote database through the database link.