Select all Table/View Names with each table Row Count in Teredata

Question

I have been stuck into a question. The question is I want to get all Table name with their Row Count from Teradata.

I have this query which gives me all View Name from a specific Schema.

I ] SELECT TableName FROM dbc.tables WHERE tablekind='V' AND databasename='SCHEMA' order by TableName;

& I have this query which gives me row count for a specific Table/View in Schema.

II ] SELECT COUNT(*) as RowsNum FROM SCHEMA.TABLE_NAME;

Now can anyone tell me what to do to get the result from Query I (TableName) and put it into QUERY II (TABLE_NAME) You help will be appreciated.

Thanks in advance,

Vrinda

Answer 1

This is a SP to collect row counts from all tables within a database, it's very basic, no error checking etc.

It shows a cursor and dynamic SQL using dbc.SysExecSQL or EXECUTE IMMEDIATE:

CREATE SET TABLE RowCounts
     (
      DatabaseName VARCHAR(30) CHARACTER SET LATIN NOT CASESPECIFIC,
      TableName VARCHAR(30) CHARACTER SET LATIN NOT CASESPECIFIC,
      RowCount BIGINT,
      COllectTimeStamp TIMESTAMP(2))
PRIMARY INDEX ( DatabaseName ,TableName )
;

REPLACE PROCEDURE GetRowCounts(IN DBName VARCHAR(30))
BEGIN
  DECLARE SqlTxt VARCHAR(500);
   FOR cur AS
      SELECT
         TRIM(DatabaseName) AS DBName,
         TRIM(TableName) AS TabName
      FROM dbc.Tables
      WHERE DatabaseName = :DBName
      AND TableKind = 'T'
   DO
     SET SqlTxt =
         'INSERT INTO RowCounts ' ||
         'SELECT ' ||
         '''' || cur.DBName || '''' || ',' ||
         '''' || cur.TabName || '''' || ',' ||
         'CAST(COUNT(*) AS BIGINT)' ||  ',' ||
         'CURRENT_TIMESTAMP(2) ' ||
         'FROM ' || cur.DBName ||
         '.' || cur.TabName || ';';

     --CALL dbc.sysexecsql(:SqlTxt);
     EXECUTE IMMEDIATE sqlTxt;
   END FOR;
END;

If you can't create a table or SP you might use a VOLATILE TABLE (as DrBailey suggested) and run the INSERTs returned by following query:

SELECT
   'INSERT INTO RowCounts ' ||
   'SELECT ' ||
   '''' || DatabaseName || '''' || ',' ||
   '''' || TableName || '''' || ',' ||
   'CAST(COUNT(*) AS BIGINT)' ||  ',' ||
   'CURRENT_TIMESTAMP(2) ' ||
   'FROM ' || DatabaseName ||
   '.' || TableName || ';'
FROM dbc.tablesV 
WHERE tablekind='V' 
AND databasename='schema' 
ORDER BY TableName;

But a routine like this might already exist on your system, you might ask you DBA. If it dosn't have to be 100% accurate this info might also be extracted from collected statistics.