Omitting the double quote to do query on PostgreSQL
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Simple question, is there any way to omit the double quote in PostgreSQL?
Here is an example, giving
select * from A;, I will retrieve
ERROR: relation "a" does not exist, and I would have to give
select * from "A"; to get the real result.
Is there any way not to do the second and instead do the first on PostgreSQL?
Your problem with this query started when you created your table. When you create your table, don't use quotes.
CREATE TABLE a ( ... );
CREATE TABLE "A" ( ... );
The latter will make it so that you always have to quote it later. The former makes it a normal name and you can use
SELECT * FROM a; or
SELECT * FROM A;
If you can't just recreate your table, use the
ALTER TABLE syntax:
ALTER TABLE "A" RENAME TO a;
Omitting the double quote to do query on PostgreSQL, What am I doing wrong? Names that aren't double-quoted will be folded to lower case. If the name you've got stored is mixed case or all� But because of the way PostgreSQL works, forcing all names to lowercase, I can still say: SELECT * FROM People; And it will work just fine. Now, there is a way around this, namely by using double quotes. Whereas single quotes in PostgreSQL are used to create a text string, double quotes are used to name an identifier without changing its case.
double quotes are required if you include capital letters in your table name in postgres
to avoid the requirements name your table "a"
Re: How to run queries without double quotes on , The SQL standard will not define a key word that contains digits or starts or ends with an Note that the escape character is written in single quotes, not double quotes. To allow more readable queries in such situations, PostgreSQL provides The explicit type cast can be omitted if there is no ambiguity as to the type the� Do most stick to lowercase > everywhere, and skip the issues, or do they keep the namestyles like > "ItemName" and just accomodate the need to double quote when it arises? I am > sure good devs could go either way, but curious if you or other have any > impressions re common practice.
Postgresql has some particular behaviour in regard to quoting and case sentivity: it folds every non-quoted identifier to lower case (also at creation time) and then works case-sensitively.
Double quotes in identifiers are only needed when the identifier (table name, column name, etc) was defined (at schema creation time) with uppercase letters (some or all) and between double quotes.
In that case (which I advice against), when you use that identifier, you must type it in the same way: case sensitively (type upper/lower case letter exactly as defined) and between double quotes.
In other cases, you can use non-quoted identifiers and work always case-insensitively.
Documentation: 9.4: Lexical Structure, I'm using a CSV file as input and putting it into my PostgreSQL database. Talend( TOS 6.2.0) creates tables and columns with double quotes. How to run queries without double quotes on tables and columns at 2009-10-11 01:30:59 from Susan M Farley; Responses. Re: How to run queries without double quotes on tables and columns at 2009-10-11 07:05:12 from Thomas Kellerer Browse pgsql-novice by date
Don't use upper case letter in your table name or it's column name, if you are using such thing then the postgres will required double quote for accessing it.
Remove double quotes while creating table in PostgreSQL!!!, postgresql double quotes column name postgresql quotation marks in queries So I wonder is there a way to keep the double quote inside but also insert One of the questions that invariably arises in these classes has to do with the case If you omit any column that accepts the NULLvalue in the INSERT statement, the� DO executes an anonymous code block, or in other words a transient anonymous function in a procedural language. The code block is treated as though it were the body of a function with no parameters, returning void. It is parsed and executed a single time. The optional LANGUAGE clause can be written either before or after the code block.
Please see the detailed description of what is happening here.
The PostgreSQL server table names are case-sensitive, but forced to be lower-case by default: when you type
CREATE TABLE AAA, it will become
CREATE TABLE aaa before the query execution.
Double-quoted names keep their case as it was, so after
CREATE TABLE "AaA" you get the table
AaA and have to write it double-quoted again and again.
Have no idea why did they do so :)
postgresql how to insert a value with double quotes inside double , I would make the check for "islower" more inline, i.e. if the column/table is The double quote character is the delimiter defined in the SQL specification, but some MixedCase columns needs to be omitted and the quoting character changed. To escape or ignore the single quote is a standard requirement for all database developers. In this post, I am sharing solution for PostgreSQL Database Server. PostgreSQL has two options to escape single quote. You can replace single quote to double single quote like (”) and the other is you can use (E’\’) to escape single quote.
Query builder does not quote mixed case table and column names , To write a string in a SQL statement, surround it with quote characters: allows you to quote strings with either single quotes or double quotes, so you can When MySQL reads the query string, it will strip off the extra quote or the backslash: I searched around quite a bit, it would be great if someone could link me to a solution or answer my query. The thing is I have a postgresql table that contains a lot of single quotes and I cant figure out how to get rid of them, because obviously this. update tablename set fieldname= NULL where fieldname=' ; wont work.
Writing Strings That Include Quotes or Special Characters, The PostgreSQL trim function removes all specified characters either from the If this parameter is omitted, the trim function will remove space characters from included single quotes around the result to demonstrate what the trim function� To escape a single quote inside your string literal, use two single quotes: 'John''s' – JNevill Aug 1 '16 at 14:08 Double single quotes inside the string literal, i.e. where owner.name = 'john''s' – jarlh Aug 1 '16 at 14:09
PostgreSQL: trim Function, You can put double quotes around any field value, and must do so if it The first example omits ROW, the second uses it; we could have done it either way. In PostgreSQL, a reference to a table name (or alias) in a query is effectively a� As in SQL names, placing double quotes around a pattern stops folding to lower case. Should you need to include an actual double quote character in a pattern, write it as a pair of double quotes within a double-quote sequence; again this is in accord with the rules for SQL quoted identifiers.
- I use the table creator wizard, and everytime I write with capital-letter, it will automatically add the doublequote
- I've never used the table creator wizard, but I would imagine there is an option in the software to not do that. It's not a very common practice to quote table names in postgres. It just makes your life harder.
- when I said "wizard", it is what is given in
- I see. I just checked, and it appears you can't turn this feature off in pgAdmin. I would suggest typing the table names in lower case when creating so that pgAdmin doesn't think the table names need to be case sensitive.
"A"is not the same as
a, sure. But is
"a"the same as
a? Instead of "don't use quotes", I feel the better advice is "don’t use uppercase".
- nice answer... Is there any reason why PostgreSQL do that (force us to put doublequotes for a capital-letter table)?
- Yes, the reason is "the ANSI standard says so".
- "...and work in case-unsensitive mode". How to do this exactly?
- @zfm: as Steve says. You create your identifiers with lower case (or without quotes - it's the same thing), and then you can use them in case-insensitive mode (not quoting them).
- sorry I misinterpret your sentence. I thought that there is an option to change that mode :D
- @zfm: the sentence was indeed confusing, I changed it.