Comma Separator (Column ⇄ List)
Paste a column of values from Excel or Google Sheets and get a comma-separated list — or paste a delimited list and get it back as a clean column. The number-one use case is the SQL IN clause: the one-click preset turns 200 customer IDs into ('C001','C002',…) with single quotes, internal apostrophes escaped, and parentheses already wrapped. Trim, dedupe, drop empties, and watch the live item count so you know exactly how many values went in.
Paste a column of values above — the comma-separated list appears here with a live item count.
How to use the comma separator (column ⇄ list)
- Pick a direction: Column → List joins one-item-per-line input; List → Column splits a delimited string back into lines.
- Paste your data. Going column-to-list, choose the delimiter and optional quote wrapping; going the other way, leave the delimiter on auto-detect.
- For SQL, hit the IN clause preset — single quotes, commas, and parentheses in one click.
- Check the item-count badge matches your expectation, then copy the result.
The spreadsheet-to-SQL workflow, end to end
An analyst gets a spreadsheet of 142 order IDs that need investigating. The query needed is SELECT * FROM orders WHERE order_id IN (…). The manual path — typing quotes and commas around 142 values — takes fifteen minutes and one typo breaks the query. The path through this tool: copy the ID column in Sheets, paste here, click the SQL preset, copy the ('1001','1002',…) output into the query. Twenty seconds, and the “142 items” badge confirms nothing was lost on the way. For numeric ID columns you can switch quoting to none — most databases accept unquoted integers in an IN list — but quoting numbers rarely hurts and protects against IDs with leading zeros being reinterpreted.
Quoting rules in two paragraphs
SQL string literals use single quotes, and a literal single quote inside a value is escaped by doubling it: O''Brien. Double quotes in standard SQL mean identifiers (column names), not strings — which is why pasting a double-quoted list into PostgreSQL throws column "value" does not exist. The single-quote option here applies the doubling rule automatically.
CSV fields use double quotes, doubled for escaping, and a field must be quoted whenever it contains the delimiter, a quote, or a newline. TSV (tab-separated) mostly sidesteps the problem because real-world values rarely contain tabs — that is why copying from Excel uses tabs and survives commas in the data. When this tool force-quotes an item containing your delimiter, it is applying exactly the CSV rule.
Frequently asked questions
How do I convert an Excel column into a SQL IN clause?
Copy the column in Excel or Google Sheets (it pastes as one value per line), paste it here, and click the SQL IN clause preset. You get ('value1','value2','value3') — single-quoted, comma-joined, parenthesised, with any apostrophes inside values doubled to '' the way SQL string literals require. Names like O'Brien come out as 'O''Brien' instead of breaking your query.
Is it safe to paste values straight into a SQL query?
Only if you trust where the values came from. Quote-escaping here prevents accidental syntax errors, but it is not a security boundary: if the values originate from users or any untrusted source, build the query with bound parameters (prepared statements), not string concatenation. This tool is for analyst workflows — ad-hoc queries against values you copied from a spreadsheet you control.
How does delimiter auto-detection work in List → Column mode?
The tool counts occurrences of the four most common delimiters — comma, semicolon, pipe, and tab — and splits on whichever appears most often. A line of European CSV data full of semicolons therefore splits on ; not ,. The detected delimiter is shown as a badge, and you can override it from the dropdown any time the guess is wrong.
What happens if one of my values contains a comma?
In Column → List mode without quoting, any item that contains your chosen delimiter is automatically wrapped in double quotes and you see a notice telling you how many items were force-quoted. Without this, a value like Austin, Texas would silently read as two items to whatever consumes your list — the classic CSV corruption bug.
Can it remove duplicates while joining?
Yes — tick Remove duplicates and the list is deduplicated (exact, case-sensitive match) before joining, with the item-count badge reflecting the deduped total. This matters for IN clauses: duplicates do not change query results, but a 10,000-value IN list slows some databases, and Oracle historically capped expression lists at 1,000 items.
What is the difference between CSV and just comma-separated text?
Real CSV (RFC 4180) has rules this quick tool only borrows from: fields containing commas, quotes, or line breaks must be double-quoted, and literal double quotes are escaped by doubling them. A plain comma-joined list with no quoting is fine for IN clauses and tag fields, but if you are building an actual .csv file with multi-line or comma-containing fields, use the quoting options — or a proper converter like our JSON to CSV tool.
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