Dollar-quoting is a PostgreSQL-specific substitute for single quotes to avoid quoting issues inside the function body. into PGSQL and I find the quotes very distracting. For example, a typical WHERE clause may look like WHERE t_name = 'database'. I spend a large proportion of my time teaching classes in a variety of open-source technologies — specifically, Ruby, Python, PostgreSQL, and Git. >> >> All of the values within the CSV are surrounded with quotation marks. The CONCAT_WS function returns a combined string that is the combination of str_1, str_2, etc., separated by the separator.. PostgreSQL CONCAT_WS function example. You could write your function definition with single-quotes just as well. PostgreSQL also accepts “ escape ” string constants, which are an extension to the SQL standard. The str_1, str_2, etc., are strings or any arguments that can be converted into strings.. So >> a null value for a field looks like "" > It should be ,, for NULL. > Have you tried WITH NULL AS ''? PostgreSQL also allows single quotes to be escaped with a backslash (\), so for example the same string could be written 'Dianne\'s horse'. The problem arises when the string constant contains many single quotes and backslashes. A foreign key is a column or a group of columns in a table that reference the primary key of another table.. 11 Don’t use double quotes in PostgreSQL. replacing single quotes. (When continuing an escape string constant across lines, write E only before the first opening quote.) Won't help --- that will match a field that is empty and *doesn't* have quotes. An escape string constant is specified by writing the letter E (upper or lower case) just before the opening single quote, e.g., E'foo'. Doubling every single quote and backslash makes the string constant more difficult to read and maintain. Input is of form 'ppp','aaa','bbb' I want it to be stripped of quotes to become ppp,aaa,bbb escaping the quote would work but it means I will have to do some... PostgreSQL › PostgreSQL - general PostgreSQL version 8.0 introduced the dollar quoting feature to make string constants more readable. > I suspect the solution is probably simple; yet, I can't get i I think you need two single quotes around the embedded sql string. PostgreSQL QUOTE_IDENT() function with Example : The PostgreSQL quote_ident function is used to make a given string with suitably double quoted, so as it can be used like an identifier in an sql statement string if required. One of the questions that invariably arises in these classes has to do with the case sensitivity of the technology in question. What is happening is that Postgres is seeing the sql string as an identifier and is looking for a column of that name. Bruce Momjian <[hidden email]> writes: > Walter wrote: >> I have a problem using the copy command on a CSV file. You could write your function definition with single-quotes just as well. The table that contains the foreign key is called the referencing table or child table. at 2001-04-03 01:25:45 from Lee Harr Responses Re: Why are quotes required around table / column names in SQL statements? Summary: in this tutorial, you will learn about PostgreSQL foreign key and how to add foreign keys to tables using foreign key constraints.. Introduction to PostgreSQL Foreign Key Constraint. The separator is a string that separates all arguments in the result string.. As you probably understand, apostrophe (otherwise known as semi-quotes or single quotes) and quote symbols are used in Postgres and many programming languages to delineate text strings and string-based commands. * does n't * have quotes many single quotes and backslashes are an extension to the standard! 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