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2012-03-19

 -- File: NetezzaCheatSheet.sql docs at the end 
 
-- how-to create a database 
CREATE DATABASE DatabaseName
;
-- how-to rename a database 
ALTER DATABASE OldDatabaseName RENAME TO NewDatabaseName 
;
-- how-to create a synomim 
CREATE SYNONYM synonym_name FOR DatabaseName.SchemaName.TableName 
;
-- how-to create a table 
CREATE TABLE ExampleTableName (
   ColVarchar varchar(80)     -- a column of the type Varchar
 , ColInt int                                 -- a column of int type
 , ColDate date                      -- a column of the type date
)
;
-- how-to insert data from non-current db to current db table
INSERT INTO TableName SELECT * FROM DatabaseName..TableName
;
-- how-to drop a table 
DROP TABLE DatabaseName..TableName 
; 
-- how-to change the ownership of a table 
ALTER TABLE TableName OWNER TO NewOwner 
;
-- how-to perform a simple select 
SELECT * FROM TableName 
WHERE 
AND 1=1 
AND WhereColumnName = 'WhereCondition' 
AND GreaterThanColumnName > 0.0
ORDER BY WhereColumnName
;
-- how-to delete from table 
DELETE FROM TableNameToDeleteFrom 
WHERE FilterColumnName = 'FilterValue'
;
-- how-to call a stored procedure 
CALL ProcName ; 
EXEC ProcName ; 
EXECUTE ProcName ; 
 
-- example stored procedure 
CREATE OR REPLACE PROCEDURE ProcName() 
RETURNS INT4 LANGUAGE NZPLSQL AS
BEGIN_PROC
  DECLARE
    StrVar varchar;
  BEGIN
    StrVar := 'This string is quoted';
  END;
END_PROC
; --END PROC
 
-- a single line comment
/*
a multi-line comment
*/
 
-- example proc with parameters
CREATE OR REPLACE PROCEDURE ProcName (int, varchar(ANY)) RETURNS int
LANGUAGE NZPLSQL AS
BEGIN_PROC
  DECLARE
    pId ALIAS FOR $1;
    pName ALIAS FOR $2;
  BEGIN
    INSERT INTO t1 SELECT * FROM t2 WHERE id = pId;
  END; 
END_PROC 
; 
 
-- Control structure
IF movies.genre = 'd' THEN
  film_genre := 'drama';
ELSIF movies.genre = 'c' THEN
  film_genre := 'comedy';
ELSIF movies.genre = 'a' THEN
  film_genre := 'action';
ELSIF movies.genre = 'n' THEN
  film_genre := 'narrative';
ELSE
-- An uncategorized genre form has been requested.
film_genre := 'Uncategorized';
END IF;
 
-- how-to list all stored procedures 
SHOW PROCEDURE ALL 
; 
 
-- how-to document a stored procedure
COMMENT ON PROCEDURE customer() IS 'Author: bsmith
Version: 1.0 Description: A procedure that writes a customer name to
the database log file.';
 
-- how-to convert date str into nzdate
select  to_date(substring(20090731 from 1 for 8),'YYYYMMDD') as NZDATE
 
-- select top 
select a.* from some_schema.some_table a limit 10
 
-- START how to remove duplicates =================================
CREATE TABLE TmpTableDuplicates as
    SELECT col11,col2,col3 from DuplicatesContainingTable 
    where FilterCol = 'FilterValue'
    group by 1,2,3
; 
DELETE FROM DuplicatesContainingTable where FilterCol = 'FilterValue'
; 
INSERT INTO Source_table select * from TmpTableDuplicates
; 
DROP TABLE TmpTableDuplicates
; 
-- STOP how to remove duplicates =================================
 
 
-- Query to get a list of views and thier definitions in a database:
SELECT VIEWNAME,OWNER,CREATEDATE,DEFINITION FROM _V_VIEW WHERE OBJTYPE='VIEW';
 
-- Query to get a list of tables in a database:
SELECT TABLENAME,OWNER,CREATEDATE FROM _V_TABLE WHERE OBJTYPE='TABLE';
 
-- Query to get a list of columns from a table or a view:
SELECT ATTNUM,ATTNAME FROM _V_RELATION_COLUMN WHERE NAME=UPPER('<TABLE NAME>')
 ORDER BY ATTNUM ASC;
 
-- Query to get list of user groups on the box:
SELECT GROUPNAME,OWNER,CREATEDATE,ROWLIMIT,SESSIONTIMEOUT,
 QUERYTIMEOUT,DEF_PRIORITY,MAX_PRIORITY FROM _V_GROUP;
 
-- Query to get list of users and the groups they are in, on the box:
 SELECT GROUPNAME,OWNER,USERNAME FROM _V_GROUPUSERS;
-- (Does not give any LDAP users in this query)
 
--Query to find the number of rows in a table without actually querying the table:
-- (Sometimes needed for some really huge tables of rowcount > 80 Billion)
 
SELECT RELNAME TABLE_NAME,
 CASE
 WHEN RELTUPLES < 0
 THEN ((2^32) * RELREFS) + ((2^32) + RELTUPLES )
 ELSE ((2^32) * RELREFS) + ( RELTUPLES )
 END NUM_ROWS
 FROM
 _T_CLASS,
 _T_OBJECT
 WHERE
 _T_OBJECT.OBJID=_T_CLASS.OID AND
 _T_OBJECT.OBJCLASS=4905 — DISPLAY ONLY TABLES
 AND RELNAME = UPPER('<TABLE NAME>');
 
--Query to check if any of the SPU's are running slower than the rest:
--  (This actually gives the read-write speed of each SPU that is online)
 
SELECT HWID, BYTE_COUNT/TOTAL_MSEC
 FROM
 _VT_DISK_TIMING
 ORDER BY 2;
 
--- One more query.. To get the list of tables and thier skew and size:
 SELECT TABLENAME,OBJTYPE,OWNER,CREATEDATE,USED_BYTES,SKEW
 FROM _V_TABLE_ONLY_STORAGE_STAT
 WHERE OBJCLASS = 4905 OR OBJCLASS = 4911
 ORDER BY TABLENAME;
 
-- Use \dt in nzsql session to get the list tables
/*
\dv to get list of views
 \dmv - list of materialized views
 \l - list of databases
 \dg - list of groups
 \du - list of users
 \dpu - permissions set to a user
 \dT - list of datatypes
 \d <tablename> - describes the table
 \act - show current active sessions
 \d - describe table(or view,sequence)
 \dt , \dv , \ds , \de - list tables,views,sequences,temp tables
 \dSt , \dSv - list system tables and views
 \df - list functions
 \l - list databases
 \dT - list data types
 \du - list users
 \dg - list groups
 \dpu - list permissions granted to a user
 \dpg - list permissions granged to a group
*/
 
-- Purpose:
-- To provide a simple cheat sheet for netezza 
-- VersionHistory
-- 1.1.0 --- ysg --- added duplicates removal , date conversion
-- 1.0.0 --- ysg --- Initial creation

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