dynamic-sql

How can I write a stored procedure that contains a dynamically built SQL statement that returns a result set? Here is my sample code: CREATE OR REPLACE FUNCTION reporting.report_get_countries_new ( starts_with varchar, ends_with varchar ) RETURNS TABLE ( country_id integer, country_name varchar ) AS $body$ DECLARE starts_with ALIAS FOR $1; ends_with ALIAS FOR $2; sql VARCHAR; BEGIN sql = 'SELECT * FROM lookups.countries WHERE lookups.countries.country_name >= ' || starts_with ; IF ends_with IS NOT NULL THEN sql = sql || ' AND lookups.countries.country_name <= ' || ends_with ; END IF; RETURN

How do I write an SQL script to create a ROLE in PostgreSQL 9.1, but without raising an error if it already exists? The current script simply has: CREATE ROLE my_user LOGIN PASSWORD 'my_password'; This fails if the user already exists. I'd like something like: IF NOT EXISTS (SELECT * FROM pg_user WHERE username = 'my_user') BEGIN CREATE ROLE my_user LOGIN PASSWORD 'my_password'; END; ... but that doesn't work - IF doesn't seem to be supported in plain SQL. I have a batch file that creates a PostgreSQL 9.1 database, role and a few other things. It calls psql.exe, passing in the name of an SQL

I have a series of history tables in an oracle 9 database. History_table_00 contains last months data, History_table_01 contains the month before, and History_table_02 the month before that. Next month, History_table_02 will automatically get renamed to history_table_03, history_table_01 renamed to history_table_02, history_table_00 renamed to history_table_01, and a new history_table_00 will be created to gather the newest history (I really hope I am making sense). Anyway, I need to write a select statement that will dynamically select all history tables. I am hoping this won't be too

I am new to PostgreSQL and found a trigger which serves my purpose completely except for one little thing. The trigger is quite generic and runs across different tables and logs different field changes. I found here . What I now need to do is test for a specific field which changes as the tables change on which the trigger fires. I thought of using substr as all the column will have the same name format e.g. XXX_cust_no but the XXX can change to 2 or 4 characters. I need to log the value in the XXX_cust_no field with every record that is written to the history_ / audit table. Using a bunch of

I have written a Dynamic Pivot Table Query based on the following. Here is a SQL FIDDLE for reference. CREATE TABLE TestTable1 ([idnumber] INT, [DataTypeId] INT) GO INSERT INTO TestTable1 VALUES (1, 108), (1, 108), (1, 108), (2, 108), (2, 108), (3, 108), (1, 109),(1, 109), (1, 110),(2, 110),(1, 111),(4, 108),(4, 108), (4, 110),(4, 111) GO Here is the Dynamic SQL that I wrote DECLARE @SQL NVARCHAR(MAX), @Cols NVARCHAR(MAX), @ColsP NVARCHAR(MAX) SELECT @Cols = STUFF((select ', ISNULL([' + CAST([DataTypeId] as varchar(10)) + '], 0) AS ''' + CAST([DataTypeId] as varchar(10)) + '''' FROM ( SELECT