select substr(t.formula,1,instr(t.formula,'/',1,1)-1) from demo t;
select substr(t.formula,instr(t.formula,'/',1,1)+1) from demo t;
update demo set Firstcol=substr(formula,1,instr(formula,'/',1,1)-1),
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Why doesn't the Oracle optimizer use my index?
Querying too much data
Most Oracle developers know that an index is useful when you can use it to restrict your result set to a small number of the total rows in a table.
So, the obvious side…
This video shows information on the Oracle Data Dictionary, starting with the Oracle documentation, explaining the different types of Data Dictionary views available by group and permissions as well as giving examples on how to retrieve data from th…