Posts (page 40)
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4 min readTo replace a string with a newline in Oracle, you can use the REPLACE function along with the CHR function. The CHR(10) function creates a newline character in Oracle.
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4 min readTo get the previous working date using trunc(sysdate) in Oracle, you can use a combination of functions and logic. One approach is to subtract 1 day from the current date (trunc(sysdate) - 1) and then check if the result falls on a weekend (Saturday or Sunday). If it does, you continue to subtract days until you reach a working day (Monday to Friday).
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5 min readTo list all users with the "SELECT ANY TABLE" permission in Oracle, you can query the DBA_SYS_PRIVS view in the Oracle database. This view contains a list of all system privileges granted to users and roles in the database. By querying this view, you can identify which users have been granted the "SELECT ANY TABLE" privilege and hence have the ability to select data from any table in the database.
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5 min readTo find exact match records with no duplicates in Oracle, you can use the SELECT statement along with the DISTINCT keyword.For example, you can write a query like this:SELECT DISTINCT column1, column2 FROM table_name WHERE column1='value1' AND column2='value2';This query will return only the unique records that exactly match the specified values in the columns column1 and column2, with no duplicates.
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3 min readTo query data group by with order by in Oracle, you can use the following syntax:SELECT column_name1, column_name2, aggregate_function(column_name) FROM table_name GROUP BY column_name1, column_name2 ORDER BY column_name1, column_name2;In this syntax, replace "column_name1, column_name2" with the column names you want to group by and order by. The aggregate_function() can be any aggregate function like SUM, COUNT, AVG, etc.
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5 min readTo extract a substring from a column in Oracle, you can use the SUBSTR function. The syntax for the SUBSTR function is as follows:SUBSTR(column_name, starting_position, length)column_name: The name of the column from which you want to extract the substring.starting_position: The position in the column where the substring extraction should begin.length: The number of characters to extract from the starting position.
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5 min readTo order results by an in condition with Oracle, you can use the ORDER BY clause in your SQL query. Simply specify the column or expression you want to order the results by, followed by the ASC (for ascending) or DESC (for descending) keyword. If you want to order the results based on a specific list of values, you can include the IN condition within the ORDER BY clause. This will allow you to customize the order in which the results are displayed based on your specified criteria.
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4 min readTo insert data conditionally in Oracle, you can use the INSERT INTO statement with the WHERE clause. The WHERE clause allows you to specify a condition that must be met before the data is inserted into the table. For example, you can use a simple IF statement within the WHERE clause to check a condition and insert data based on that condition. You can also use subqueries or JOINs within the INSERT INTO statement to insert data conditionally from multiple tables.
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4 min readTo grant user privileges in Oracle, you need to have the appropriate permissions as a database administrator. To grant privileges, you can use the GRANT statement followed by the specific privileges you want to grant, such as SELECT, INSERT, UPDATE, DELETE, etc. You also need to specify the objects on which these privileges should be granted, such as tables, views, or sequences.
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4 min readIn Oracle, you can escape special characters by using the backslash () character. When you want to include a special character in a string, you can precede the special character with a backslash to tell Oracle to treat it as a literal character rather than as part of the syntax. For example, if you want to include a single quote (') in a string, you can escape it by writing it as follows: 'It's a beautiful day'.
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9 min readTo improve an update query in Oracle, you can consider several strategies. Firstly, make sure you are updating only the necessary columns and rows by using a WHERE clause to filter the records that need to be updated. Additionally, you can optimize the query by adding appropriate indexes to the columns involved in the WHERE clause for faster retrieval of data. It is also beneficial to avoid using functions or complex expressions in the update statement as they can slow down the query.
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6 min readTo create hook modules for PyInstaller, you can start by creating a new Python file with the naming convention "hook-module_name.py" in the hooks directory of your PyInstaller installation. In this file, you can define the hooks for specific third-party packages or modules that need to be included in the bundled executable.