data wrangling with r

If Oracle implements data that does not exist, data is inserted. If data exists, data is updated (insertorupdate) The idea is to write a function that first queries data based on conditions. If data is queried, it is updated. If n

Problem description: Import data from system A, synchronize data to system B, delete data from system A, and delete data from system B. Premise: A and B have completed A FULL_IMPORT and FULL_SYNC. Assume that all data in A is matched in B (filtering is not considered. Accor

The previous article briefly introduced the conceptual data model, the logical data model, the physical data Model basic concept, the characteristic as well as the three corresponding database development stage. Now for the three kinds of data models used in the logical data

In FIM synchronization, apart from the previous mention, after deleting database A, you need to delete database B synchronously (Click here ). There is also a common requirement: Generally, a database record is not deleted in an application system, but only marked. Operation logic: 1. Delete the user from the data source-> Delete the corresponding Metaverse object (in this case, the CS object corresponding to the application system and the correspondi

Data listening and Data Interaction in vue, vue data listening data Now let's take a look at the data listening event $ watch in vue, Js Code: New Vue ({el: "# div", data: {arr: [1, 2, 3]}). $ watch ("arr", function () {alert ("

Keil will have a line after compiling: program size:code=xxx ro-data=xxx rw-data=xxx zi-data=xxx Code represents the execution of the codes, and all functions in the program are located here. Ro-data represents read-only data, and the global constant

Data consistency verification for data migration and data migration. Data consistency verification during data migration. it is useful to perform some necessary verification during database migration. for example, whether the number of d