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Add support for MSSQL's SELECT TOP N syntax (#150)

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Add support for MSSQL SELECT TOP (N) [PERCENT] [WITH TIES] syntax.
This commit is contained in:
Alex Kyllo 2020-01-12 20:20:48 -08:00 • committed by Nikhil Benesch
parent 4cdd6e2f84
commit 172ba42001
7 changed files with 126 additions and 10 deletions
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42
tests/sqlparser_mssql.rs
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@ -68,6 +68,48 @@ fn parse_mssql_apply_join() {
);
}
#[test]
fn parse_mssql_top_paren() {
let sql = "SELECT TOP (5) * FROM foo";
let select = ms_and_generic().verified_only_select(sql);
let top = select.top.unwrap();
assert_eq!(Some(Expr::Value(number("5"))), top.quantity);
assert!(!top.percent);
}
#[test]
fn parse_mssql_top_percent() {
let sql = "SELECT TOP (5) PERCENT * FROM foo";
let select = ms_and_generic().verified_only_select(sql);
let top = select.top.unwrap();
assert_eq!(Some(Expr::Value(number("5"))), top.quantity);
assert!(top.percent);
}
#[test]
fn parse_mssql_top_with_ties() {
let sql = "SELECT TOP (5) WITH TIES * FROM foo";
let select = ms_and_generic().verified_only_select(sql);
let top = select.top.unwrap();
assert_eq!(Some(Expr::Value(number("5"))), top.quantity);
assert!(top.with_ties);
}
#[test]
fn parse_mssql_top_percent_with_ties() {
let sql = "SELECT TOP (10) PERCENT WITH TIES * FROM foo";
let select = ms_and_generic().verified_only_select(sql);
let top = select.top.unwrap();
assert_eq!(Some(Expr::Value(number("10"))), top.quantity);
assert!(top.percent);
}
#[test]
fn parse_mssql_top() {
let sql = "SELECT TOP 5 bar, baz FROM foo";
let _ = ms_and_generic().one_statement_parses_to(sql, "SELECT TOP (5) bar, baz FROM foo");
}
fn ms() -> TestedDialects {
TestedDialects {
dialects: vec![Box::new(MsSqlDialect {})],