Search for a command to run...
Articles tagged with #programming-languages
Problem Description & Analysis: The query results of the Postgresql database return 6 columns, with the first column being the grouping column, the second column being the Value column within the group, and columns 3–6 being the Key columns within th...
Problem Description & Analysis: The first two columns of a certain database table have duplicate values, such as the 2nd-3rd records and the 1st record being duplicated below. Task: Now we need to change all duplicate values to null. In other words,...
Problem Description & Analysis: There are two tables in a certain database. The original inventory table data_add stores multiple batches of inventory for multiple items. Each batch of inventory has a starting number START_NUM and an ending number EN...
Problem Description & Analysis: A certain database has a ticket table and a work hour table. The ticket table stores the relationship between each ticket and its parent ticket, forming a self-association structure: The work hour table stores multipl...
Problem description & analysis: The field n of a certain database table is used for sorting, and the x field is an integer, sometimes with consecutive 0s. Task: Now we need to add a calculated column def, which requires the initial value of def to b...
Problem description & analysis: The database table tbl has a string field DESCRIPTION. Task: Now we need to retrieve the word ‘EN’ and the subsequent string of numbers from the DESCRIPTION field. The string of numbers may consist entirely of digits,...
