Blog

5 minutes read
To coalesce two columns with a default value of 0 in PostgreSQL, you can use the COALESCE function. This function returns the first non-null value from a list of arguments.You can achieve this by using the COALESCE function with the two columns as arguments, and specifying 0 as the default value.
10 minutes read
In Oracle, the equivalent of the object_name() function would be the USER_OBJECTS view. This view provides information about objects owned by the current user, including tables, views, procedures, functions, packages, and more. By querying the USER_OBJECTS view, you can retrieve the names of all the objects owned by the current user.[rating:dc3bb8f1-bf14-46f8-a39b-16fc925c6a8c]How to check the availability of object_name() in Oracle.
8 minutes read
In PostgreSQL, you can save temporary session variables by using the SET command. These variables are only available for the duration of the current session and will be automatically reset once the session ends.
9 minutes read
You can display the number of "missing" hours in Oracle by using a SQL query that calculates the difference between the total hours in a day and the sum of hours recorded in a table. This can be achieved by using aggregate functions such as SUM and GROUP BY to calculate the total hours recorded for each day, and then subtracting this value from the total number of hours in a day (usually 24). The result will be the number of hours that are "missing" or not recorded in the table.
5 minutes read
To create a helper function for queries in PostgreSQL, you can define a new function using the CREATE FUNCTION statement. Inside the function, you can write the custom logic that you want to use for querying the database.You can pass parameters to the function to customize the query based on different conditions. This can make your helper function more versatile and reusable for different scenarios.
10 minutes read
The "is" keyword in Oracle procedures is used as a delimiter to separate the parameters and the local variables within the procedure definition. It is not necessary for the functionality of the procedure, but helps in improving the readability and organization of the code. By using "is", developers can clearly distinguish between the parameters that are being passed into the procedure and the variables that are used within the procedure's body.
10 minutes read
To remove '\r\n' from a base64 string in Oracle, you can use the REPLACE function to replace it with an empty string. Here is an example query that demonstrates how to do this: SELECT REPLACE(base64_string_column, '\r\n', '') AS cleaned_base64_string FROM your_table_name; In this query, 'base64_string_column' is the column in your table that contains the base64 string that you want to clean.
5 minutes read
To update partial value in PostgreSQL, you can use the UPDATE statement with a WHERE clause to specify the condition for which rows to update. You can also use the SET clause to specify the columns and values that you want to update. By using a combination of WHERE and SET clauses, you can update only specific columns or values in a table, leaving the rest of the data unchanged. This allows you to update partial values in PostgreSQL without affecting the entire row.
12 minutes read
To convert an outer join select query to a merge in Oracle, you can use the MERGE statement in Oracle to perform a similar operation. The MERGE statement allows you to merge data from a source table to a target table based on a specified condition.To convert the outer join select query to a merge statement, you would need to identify the source and target tables, specify the join condition, and define the actions to be taken when a match is found or not found.
8 minutes read
In PostgreSQL, the bit data type is used to store fixed-length binary strings. When mapping a column with type bit(24) in PostgreSQL with Hibernate, you can use the @Type annotation along with the BitStringType class provided by Hibernate.To map a column with type bit(24), you can annotate the corresponding field in your entity class with @Column and @Type(type = "org.hibernate.type.BitStringType").