Posts - Page 188 (page 188)
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3 min readTo convert a varchar to a number in Oracle, you can use the TO_NUMBER function. This function converts a character string into a number. The syntax for the TO_NUMBER function is: TO_NUMBER(input_string, format_mask) where input_string is the varchar that you want to convert to a number and format_mask specifies the format of the input_string. The format_mask is optional and can be used to control the conversion process. If you do not provide a format_mask, Oracle will use the default format.
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2 min readTo concatenate strings in Oracle, you can use the || operator. This operator allows you to combine multiple strings into one. For example, if you want to concatenate the strings 'Hello' and 'World', you can do so like this:SELECT 'Hello' || 'World' FROM dual;This will result in the output 'HelloWorld'. You can also concatenate column values from a table by using the || operator in a SELECT statement.
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5 min readIn pandas, you can extend multilevel columns by creating a list of tuples to define the multi-level index. This can be achieved by setting the "columns" attribute of a DataFrame or by using the "MultiIndex.from_tuples" method. This allows you to represent multiple levels of columns in a DataFrame, which can be useful for organizing and analyzing complex data structures.
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5 min readTo convert an XMLType data type to a VARCHAR data type in Oracle, you can use the getStringVal() method. This method returns the XMLType data as a VARCHAR value. Here is an example query that demonstrates how to convert an XMLType to a VARCHAR: SELECT XMLColumn.getStringVal() AS VARCHARColumn FROM YourTableName; Replace XMLColumn with the name of your XMLType column and YourTableName with the name of your table. This query will return the XML data stored in the XMLType column as a VARCHAR value.
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3 min readTo change the arrow head style in Matplotlib annotate, you can specify the arrowprops parameter when calling the annotate function. Within the arrowprops parameter, you can set the headstyle property to customize the arrow head style. Some available options for arrow head style include '->' for a plain arrow, '<-' for a backwards arrow, 'fancy' for a curved arrow head, and more.
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5 min readTo apply a function to multiple multiindex columns in pandas, you can use the apply function along with axis=1 parameter. If you have a DataFrame with a multiindex column, you can specify the level of the multiindex that you want to apply the function to. This can be achieved by specifying the level parameter when calling the apply function. By specifying level=0 for a multiindex, you can apply the function to the first level of the multiindex columns.
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3 min readTo plot a list of byte data with matplotlib, you can first convert the byte data to numeric values that can be plotted. One way to do this is by using the struct module in Python to unpack the byte data into integers. Once you have converted the byte data to a list of numeric values, you can then use matplotlib to create a plot by calling functions such as plt.plot() or plt.scatter().
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5 min readTo import a CSV file into a remote Oracle database, you can use SQLLoader, Oracle Data Pump, or Oracle SQL Developer. SQLLoader is a command-line tool that loads data from external files into Oracle databases. Oracle Data Pump is a feature of Oracle Database that provides high-speed data transfer for loading and unloading data. Oracle SQL Developer is a graphical tool that allows you to import and export data easily.
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4 min readTo save multiple animations into one in matplotlib, you can create each animation separately and then combine them into a single figure. One way to do this is by creating subplots within a single figure using the add_subplot function. You can then plot each animation on a different subplot and save the entire figure using the savefig function. This allows you to save all the animations into one file for easy access and sharing.
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3 min readTo place text in matplotlib on a line, you can use the text() function provided by matplotlib. The text() function takes in the x and y coordinates where you want the text to be placed, as well as the actual text you want to display. You can also specify additional parameters such as the color, font size, and font style of the text. By providing the appropriate x and y coordinates, you can place the text directly on a line in a matplotlib plot.
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4 min readTo keep only a specific item of a list within a pandas dataframe, you can use the .loc method to filter out the rows that do not contain the desired item. You can specify the column where the list is stored and use the .str accessor to access the elements of the list. Then, you can use the .str.contains method to check if the item is present in the list. Finally, you can use the .loc method to keep only the rows that meet the condition.
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4 min readTo get case insensitive records from Oracle, you can use the UPPER() or LOWER() functions in your query. By applying these functions to the column you want to search, you can ensure that the query is not case sensitive. For example, you can use a query like this: SELECT * FROM table_name WHERE UPPER(column_name) = UPPER('search_value'); This query will return records where the column_value matches the search_value regardless of the case.