TopMiniSite
-
5 min readTo modify a map in Elixir, you can use the Map.put/3 function to add or update key-value pairs in the map. This function takes three arguments: the map you want to modify, the key you want to add or update, and the value you want to set for that key.For example, if you have a map called my_map with the key :name and the value "Alice", and you want to update the value to "Bob", you can do so by calling Map.put(my_map, :name, "Bob").
-
4 min readTo get random elements from an Elixir map, you can convert the map to a list, shuffle the list using the :random library, and then take the desired number of elements from the shuffled list. This can be achieved by first using the Map.to_list() function to convert the map to a list of tuples. Then, you can use the Enum.shuffle() function from the Enum module to shuffle the list. Finally, you can use the Enum.
-
4 min readIn Oracle, you can calculate a checksum using the DBMS_CRYPTO package. This package provides various encryption and hashing functions, including checksum calculations. To calculate a checksum, you can use the DBMS_CRYPTO.HASH function, which takes the input data and a hash algorithm as parameters and returns the checksum value. The checksum value is a numeric representation of the input data that can be used to verify data integrity.
-
4 min readTo disable Elixir compiler warnings, you can use the @suppress_warnings attribute before the module definition. This attribute suppresses all warnings that the compiler would normally raise for the entire module. Alternatively, you can also use the @skip_compilation attribute to skip the compilation of a specific module, effectively disabling all warnings related to that module. Additionally, you can also use compiler flags when compiling your Elixir code to ignore specific types of warnings.
-
6 min readTo put comma separated values to a column in Oracle, you can use the LISTAGG function. This function aggregates values from multiple rows into a single string, with the values separated by a specified delimiter.
-
5 min readTo create a calendar table in Oracle, you can start by creating a new table in your database that will hold the necessary information for each day in the calendar. The structure of the table should include columns such as date, year, month, day, day of the week, and any other relevant information you may need.Once the table is created, you can use SQL queries to populate it with data.
-
2 min readTo get the date and time in a different timezone in Oracle, you can use the AT TIME ZONE clause in a SQL query. This clause allows you to specify a different timezone to convert a date or timestamp to. For example, if you want to get the current date and time in the timezone of New York, you can use the following query: SELECT SYSTIMESTAMP AT TIME ZONE 'America/New_York' FROM DUAL; This will return the current timestamp converted to the timezone of New York.
-
4 min readTo trim milliseconds off a timestamp field in Oracle, you can use the TRUNC function with the appropriate format mask. You can use the TRUNC function to round down a timestamp to the nearest second or minute, effectively removing the milliseconds. For example, you can use TRUNC(my_timestamp_column, 'MI') to round down to the nearest minute. This will remove the milliseconds from the timestamp.
-
4 min readTo get the index of a substring in Oracle, you can use the INSTR function. This function returns the position of a substring within a string. The syntax for using the INSTR function is:INSTR(string, substring)For example, if you want to find the index of the substring 'abc' in the string 'abcdef', you would use the following query:SELECT INSTR('abcdef', 'abc') FROM dual;This would return the index of the substring 'abc' in the string 'abcdef'.
-
5 min readMigrating data in Oracle involves transferring data from one database to another. There are several methods for migrating data in Oracle, including using data pump utilities, export/import tools, or using SQL*Loader.Data pump utilities, such as expdp and impdp, are commonly used to export and import data in Oracle. These utilities allow you to dump the data from one database to a file and then import it into another database.
-
4 min readIn Oracle, you can add seconds to a TIMESTAMP datatype using the INTERVAL data type. You can use the INTERVAL keyword followed by a number of seconds to add, then specify the unit of time (in this case 'SECOND').