cheat.sheets/sheets/_db2/queries

--Put a lock at table level
LOCK TABLE tbl1 IN EXCLUSIVE MODE

--Execute a query without regard of commit rows
SELECT * FROM tbl1 WITH UR --RR,RS,CS

--Execute a query with only 5 rows
SELECT * FROM tbl1 FETCH FIRST 5 ROWS ONLY

--Perform a query to a dummy table (dual)
SELECT 'Any string' FROM SYSIBM.SYSDUMMY1

--Perform a query calling a function
SELECT HEX(col2) FROM tbl5

--Call a function
VALUES HEX('AnyText')

--Perform a cast
VALUES CAST('123' AS INTEGER)

--Concatenate
VALUES 'AnyText' || 5
VALUES 'AnyText' concat 5

--Escape a single quote in a text field
VALUES 'Sinead o''Connor'

--Query the database catalog
SELECT * FROM SYSCAT.TABLES
SELECT * FROM SYSCAT.TABAUTH
SELECT * FROM SYSCAT.ROUTINES