[API reference](https://evolu.dev/docs/api-reference) › [@evolu/sqlite-wasm](https://evolu.dev/docs/api-reference/sqlite-wasm) › [c-api](https://evolu.dev/docs/api-reference/sqlite-wasm/c-api) › sqlite3\_column\_decltype

```ts
function sqlite3_column_decltype(
  deps: SqliteWasmDep,
): (pStmt: SqliteStmtPtr, iCol: number) => 0 | CStringPtr;
```

Defined in: [packages/sqlite-wasm/src/CApi.ts:2227](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/CApi.ts#L2227)

Returns the declared type of the table column a result column comes from, or
NULL when the result column is an expression or subquery. The statement owns
the string.

Wasm type `i(ii)`. Signature `["sqlite3_column_decltype", "string",
"sqlite3_stmt*", "int"]` from SQLite's table.

See https://sqlite.org/c3ref/column_decltype.html.