I have a table with multiple columns (colA, colB, colC) and I want to run a query against each of them and store the result so I can use them for comparison purposes later, for example this query to find the ratio of NULL and not NULL values in a column:
SELECT COUNT(*) - COUNT(column), COUNT(column) FROM table;
I have too many columns to do this manually, so I'm looking for a way for it to cycle through each column and store the result. Using a WHILE loop in t-sql doesn't seem to be suitable to this problem, and trying to use for loop with R doesn't work at all:
tableDataColumnName <- names(tableDataDataframe)
for (i in tableDataColumnName){
nullColumnNumber <- dbGetQuery(con, "SELECT COUNT (*) - COUNT(i), COUNT(i) FROM dbo.table;")
}
Is there a way to execute a query multiple times, once for each column in a table, without doing so manually?