diff --git a/semester4/dmdb/parts/00_sql/01_operations.tex b/semester4/dmdb/parts/00_sql/01_operations.tex
index aac7d98..72b44ff 100644
--- a/semester4/dmdb/parts/00_sql/01_operations.tex
+++ b/semester4/dmdb/parts/00_sql/01_operations.tex
@@ -3,13 +3,16 @@
               \texttt{FROM table d, table2 c} & selects the target tables. Can use range variables (\texttt{d, c} here) \\
               \texttt{WHERE}                  & Filter results. Can also target non-acquired columns                    \\
               \texttt{DISTINCT}               & Returns elements without duplicates                                     \\
+              \texttt{IN}                     & Checks if the element is present in subquery                            \\
               \texttt{UNION}                  & Set union (also removes duplicates)                                     \\
               \texttt{INTERSECT}              & Set intersection                                                        \\
               \texttt{EXCEPT}                 & Set difference                                                          \\
               \texttt{JOIN}                   & Join tables, always requires a ON clause                                \\
-              \texttt{DATE}                   & Used to do comparisons against fixed Dates (followed by Datesting)      \\
+              \texttt{ON}                     & Specify on which column with what condition to join the tables          \\
+              \texttt{DATE}                   & Used to do comparisons against fixed Dates (followed by Datestring)     \\
+              \texttt{AS}                     & Rename a column                                                         \\
               \texttt{AVG(column)}            & Computes the average of the specified column                            \\
-              \texttt{SUM(column)}            & Computes the sum of the specified column                            \\
+              \texttt{SUM(column)}            & Computes the sum of the specified column                                \\
 \end{tables}
 
 We can directly add new columns to our result using statements like (also note that we do not actually return salary and employment columns)