How to put records into a table, change them and how to take them out again. INSERT is used to add records. UPDATE can change an existing record. DELETE removes records. 'INSERT..SELECT' copies data from a SELECT into a table. INSERT: Not all fields need be specified. Default values may be specified in the CREATE TABLE clause - otherwise NULL is used. Insert a date. Explicitly enter a NULL. Can't INSERT because of reference. Cannot DELETE because of reference. Can't insert data because of incompatable formats. String contains a quote ' to select the data from 20 different columns into one changing the values according to one other column consisting the positions of the 20 columns