Common SQL commands

Common SQL commands: (1) Data Record Filtering: SQL = "select * from data table where field name = Field Value Order by field name [DESC]" SQL = "select * from data table where field name like/'% Field Value %/'order by field name [DESC]" SQL = "select top 10 * from data table where field name order by field name [DESC]" SQL = "select * from data table where field name in (/'value 1/',/'value 2/',/'value 3 /')" SQL = "select * from data table where field name between value 1 and value 2" (2) update data records: SQL = "update data table set field name = field value where condition expression" SQL = "update data table set field 1 = value 1, Field 2 = value 2 ...... Field n = value n where condition expression" (3) Delete data records: SQL = "delete from data table where condition expression" SQL = "delete from data table" (delete all data table Records) (4) add data records: SQL = "insert into data table (Field 1, Field 2, Field 3 ...) Values (value 1, value 2, value 3 ...) " SQL = "insert into target data table select * from source data table" (add records of source data table to target data table) (4) statistical functions of data records: AVG (field name) returns the average value of a table column Count (* | field name) statistics on the number of data rows or the number of data rows with values in a column Max (field name) obtains the maximum value of a table column. Min (field name) obtains the minimum value of a table column. Sum (field name) adds the values in the data column The method for referencing the above functions: SQL = "select sum (field name) as Alias from data table where condition expression" Set rs = conn. excute (SQL) Use RS ("alias") to obtain the calculation value. Use the same method for other functions. (5) Create and delete data tables: Create Table data table name (Field 1 type 1 (length), Field 2 type 2 (length )...... ) Example: Create Table tab01 (name varchar (50), datetime default now ()) Drop table data table name (permanently delete a data table) Method of record set object: Rs. movenext moves the record pointer down a row from the current position Rs. moveprevious transfers the record pointer from the current position to a row up Rs. movefirst move the record pointer to the first row of the data table Rs. movelast moves the record pointer to the last row of the data table Rs. absoluteposition = n move the record pointer to the nth row of the data table Rs. absolutepage = n move the record pointer to the first row of page n Rs. pagesize = N set N records per page Rs. pagecount the total number of pages returned Based on pagesize settings Rs. recordcount total number of returned records Rs. bof indicates whether the record pointer exceeds the first end of the data table. True indicates yes, and false indicates no. Rs. EOF indicates whether the returned record pointer exceeds the end Of the data table. True indicates yes, and false indicates no. Rs. Delete deletes the current record, but the record pointer does not move down Rs. addnew add record to end of data table Rs. Update update data table records