dynamic-sql

We have to find columns of a table with only NULL values. We are trying to build a plpgsql function that takes a table's name and returns the list of such columns. How to create such a function? We are using PgAdmin 1.16. Erwin Brandstetter You can query the catalog table pg_attribute to get a list of columns which are not defined NOT NULL and therefore can hold NULL values: SELECT quote_ident(attname) AS column_can_be_null FROM pg_attribute WHERE attrelid = 'tbl'::regclass -- valid, visible table name AND attnum >= 1 -- exclude tableoid & friends AND NOT attisdropped -- exclude dropped

With reference solution I've posted in my previous post resulted in one more situation. While trying to insert into my destination table(schema as below). -- Table: normalized_transaction -- DROP TABLE normalized_transaction; CREATE TABLE normalized_transaction ( transaction_id uuid, file_id uuid, account_number character varying(40), currency character varying(3), trade_date date, value_date date, narration character varying(200), amount numeric, mesitis_account_number character varying(50), tag character varying(255), supporting_file_id uuid, supporting_record_id uuid, status integer DEFAULT

Similar to this previous question for a one-to-one mapping I need a solution for multiple columns in source and destination. Still working with Postgres 9.4.4, the query and schema are modified and are as below: Let's say I have these two tables Table1 and Table2 : Create table Table1(col1 int, col2 varchar(100), col3 varchar(100)); Create table Table2(col1 int, col2 varchar(100), col3 varchar(100)); There is another table Table3 storing a formula for migrating data from Table1 to Table2 : CREATE TABLE Table3 ( tbl_src character varying(200), col_src character varying(500), tbl_des character

I have to convert from lat and long to geom to use PostGIS. My problem, I have various tables from different locations and I want to pass the table as a parameter to the function. I'm trying this: CREATE or REPLACE FUNCTION convert_from_lon_lat(float,float,character varying) RETURNS integer AS $$ select id from $3 as vertices order by vertices.geom <-> ST_SetSrid(ST_MakePoint($1,$2),4326) LIMIT 1; $$ LANGUAGE SQL; but I get a syntax error. EDIT1: So I changed the previous code to this: CREATE or REPLACE FUNCTION convert_from_lon_lat(long float, lat float, _table character varying) RETURNS

For example: I have a VIEW called "view1" which contains 'name' and 'slno' columns, now i want it to be display using FUNCTION called "f1" as shown below: --Function create or replace function f1(viewname varchar) returns table (name varchar,slno integer) as $body$ begin return query select * from viewname; end; $body$ language plpgsql; This is dynamic SQL, so you need EXECUTE . RETURN QUERY EXECUTE format('SELECT * FROM %I', "name"); Separately, that's a weird thing to want to do. 来源： https://stackoverflow.com/questions/22753868/postgresql-how-to-pass-table-view-name-as-a-parameter-to