Postgres Syntax Error at or Near "If"

Postgres syntax error at or near IF

IF and other PL/pgSQL features are only available inside PL/pgSQL functions. You need to wrap your code in a function if you want to use IF. If you're using 9.0+ then you can do use DO to write an inline function:

do $$
begin
  -- code goes here
end
$$

If you're using an earlier version of PostgreSQL then you'll have to write a named function which contains your code and then execute that function.

facing syntax error at or near if postgres

You're missing begin and end and a few semicolons. This should work:

create procedure learnpostgre(x integer, y integer)
language plpgsql
as $$
begin
if x > y
then
raise 'X is greater';
end if;
end
$$

Syntax error at or near IF PostgreSQL

Drop the semicolon after "BEGIN"? That's if this is the body of a plpgsql function.

If this is a psql script, the IF statement needs to be given to plpgsql to execute, so it needs putting in a DO $$ ... $$ construct.

Or, of course, you could refactor like so:

INSERT INTO table2(x,y)
    SELECT 'abc', 7
    WHERE NOT EXISTS (SELECT 1 FROM table1 WHERE z = 'aaaaa')

Syntax error at or near IF in PostgreSQL

IF is not implemented in the sql language but it is in the plpgsql language, see the manual.

You can either replace LANGUAGE sql by LANGUAGE plpgsql and then add BEGIN and END in the function body :

CREATE OR REPLACE FUNCTION public.add_activity(IDactivity smallint,Date_Start date, Data_End date, 
Type character varying,Name character varying DEFAULT NULL::character varying,
Typology character varying DEFAULT NULL::character varying, Client smallint DEFAULT NULL::smallint)
RETURNS void
LANGUAGE plpgsql
AS $BODY$
BEGIN
INSERT INTO public."Activity" 
VALUES(IDactivity, Date_Start, Data_End, Type, Name);

IF Type = 's' THEN
INSERT INTO public."Service" 
VALUES(IDactivity, Typology, Client); 
END IF;

END ;
$BODY$

Or you can change your code to stay in the sql language :

CREATE OR REPLACE FUNCTION public.add_activity(IDactivity smallint,Date_Start date, Data_End date, 
Type character varying,Name character varying DEFAULT NULL::character varying,
Typology character varying DEFAULT NULL::character varying, Client smallint DEFAULT NULL::smallint)
RETURNS void
LANGUAGE sql
AS $BODY$

INSERT INTO public."Activity" 
VALUES(IDactivity, Date_Start, Data_End, Type, Name);

INSERT INTO public."Service"
SELECT IDactivity, Typology, Client
WHERE Type = 's' ;

$BODY$

Postgres syntax error near if

try changing

RETURNS trigger AS $PRC_EPV_$

begin

  Declare BaseCount bigint default 0;
  Declare PeakCount bigint default 0;
  Declare BaseSUM DOUBLE PRECISION default 0;
  Declare PeakSum DOUBLE PRECISION default 0;

    IF new.epv_kw_1

into

RETURNS trigger AS $PRC_EPV_$
Declare 
  BaseCount bigint default 0;
  PeakCount bigint default 0;
  BaseSUM DOUBLE PRECISION default 0;
  PeakSum DOUBLE PRECISION default 0;
begin
    IF new.epv_kw_1

PostgreSQL merge query for update stock information - syntax error at or near MERGE

As others have indicated Postgres does not (yet) have the merge statement. However, you do not need it. Your statement will update the main_table for the product_id from the update_table that exist in main_table, however if the product_id in update_table does not exist in main_table, the statement bypasses the update and continues. This is because an attempt to update a non-existing row is not an error. Postgres does the same thing with update ... from ... So: (see demo)

update main_table mt  
   set product_stock = ut.product_stock
  from update_table ut
 where ut.product_id = mt.product_id;

The downside being you get no notification of the updates that did not happen. But then Merge does not give a notice either.

Postgres Error : syntax error at or near (

Probably you need commas between paranthesis for each record. And "Kenit" should be in quotes

insert into  Employee(no,name,phone) values ((1,'Kenit',999999999),
(2,'Kenit',999999999),(3,'Kenit',999999999),(4,'Kenit',999999999),
(5,'Kenit',999999999),(6,'Kenit',999999999))

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