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6 min readIn Oracle PL/SQL, special characters can be used in string literals, comments, and identifiers. Special characters can be used to represent non-printable characters, escape sequences, or non-ASCII characters. To use special characters in string literals, you can enclose the string in single quotes and use escape sequences for special characters such as newline (\n), tab (\t), and backslash (\). In comments, special characters like the forward slash (/) and asterisk (*) should be escaped.
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5 min readTo read or convert a long raw data type in Oracle, you can use the DBMS_LOB package in PL/SQL. This package provides procedures and functions for working with large objects such as long raw data.You can use the DBMS_LOB functions to read the long raw data into a temporary LOB variable, and then convert it to a different data type such as a varchar2 or blob.To read a long raw data type, you can use the DBMS_LOB.
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4 min readIn Oracle, the REGEXP_LIKE() function can be used for concatenation by incorporating it into a SQL query. This function is typically used for pattern matching within strings, but it can also be used to filter and concatenate values in a specific format.To use REGEXP_LIKE() for concatenation in Oracle, you can include it within the SELECT statement along with the CONCAT() or the double pipe (||) operator to append values together.
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6 min readTo zoom in or out with wxPython, you can use the SetScale method of wx.GraphicsContext. You can create a GraphicsContext object using the CreateGraphicsContext method of a wx.Window object. Once you have the GraphicsContext, you can use its SetScale method to zoom in or out by specifying values for the x and y scales. For example, to zoom in on an object by a factor of 2, you can use context.SetScale(2, 2). Similarly, to zoom out by a factor of 0.5, you can use context.SetScale(0.5, 0.5).
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5 min readTo fetch records between two timestamps in Oracle, you can use the "BETWEEN" keyword along with the "TO_TIMESTAMP" function. You can specify the start and end timestamps in the query to retrieve records that fall within that time range.
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4 min readWhen choosing the size of a tablespace in Oracle, it is important to consider factors such as the amount of data that will be stored in the tablespace, the growth rate of the data, and the allocated budget for storage. It is recommended to allocate enough space to accommodate the current data as well as future growth, to prevent performance issues and the need for frequent resizing of the tablespace.
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3 min readIn Oracle, you can parse JSON data using the JSON_VALUE, JSON_QUERY, and JSON_TABLE functions. The JSON_VALUE function is used to extract scalar values from JSON objects, while JSON_QUERY is used to extract object or array values. JSON_TABLE function is used to convert JSON data into relational format.You can also use the dot notation to navigate through the JSON hierarchy in Oracle. For example, you can access nested objects by specifying the key path using the dot notation.
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6 min readTo update a CLOB (Character Large Object) field in Oracle, you can use the dbms_lob package. First, you need to select the CLOB data using a select statement. Then, use the dbms_lob.write procedure to update the CLOB data.Here is an example of how you can update a CLOB field in Oracle: DECLARE l_clob CLOB; BEGIN SELECT clob_column INTO l_clob FROM your_table WHERE condition; dbms_lob.write(l_clob, DBMS_LOB.
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8 min readTo run Oracle PL/SQL in Python, you can use the cx_Oracle module, which allows Python programs to connect to Oracle databases. With cx_Oracle, you can execute SQL and PL/SQL statements, fetch data from Oracle databases, and interact with Oracle stored procedures, functions, and packages.To get started, you need to install the cx_Oracle module in your Python environment.
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5 min readIn Oracle, updating table statistics is important for the query optimizer to generate efficient execution plans. To update table statistics in Oracle, you can use the DBMS_STATS package.You can gather statistics for a specific table or schema using the DBMS_STATS package procedures such as GATHER_TABLE_STATS or GATHER_SCHEMA_STATS. These procedures collect information about the data distribution in the table, index statistics, and column histograms.
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5 min readIn Oracle, if a subquery returns more than one value, it can cause an error when used in a query. To resolve this issue, you can try using the IN or ANY keyword to compare the results of the subquery with a single value. Another option is to use the MAX() or MIN() functions to aggregate the results of the subquery into a single value. You can also use the ROWNUM or ROW_NUMBER() function to limit the number of results returned by the subquery.