A SQL query parser written using nom.
- Query
- Select
- From
- Where
- Order by
- Limit
- CTE
- Group by
- Having
- Aggregate
- Window
- Pratt Parsing
- Friendly error info
More examples can be found in tests.
select a, count(*)
from (select * from t1) as t2
join t3 on t2.a = t3.a
left join t4 on t3.b = t4.b
where a > ((1 + 2) * 3) and b < c
group by a, c
having count(*) > 5
order by a, b desc
limit 1, 2output ast:
SelectStatement {
body: Select {
projection: [
UnnamedExpr(
ColumnRef {
database: None,
table: None,
column: Ident {
value: "a",
},
},
),
UnnamedExpr(
Function {
name: Ident {
value: "count",
},
distinct: false,
args: [
Wildcard,
],
},
),
],
from: Some(
Join {
op: LeftOuter,
condition: On(
BinaryOp {
left: ColumnRef {
database: None,
table: Some(
Ident {
value: "t3",
},
),
column: Ident {
value: "b",
},
},
op: Eq,
right: ColumnRef {
database: None,
table: Some(
Ident {
value: "t4",
},
),
column: Ident {
value: "b",
},
},
},
),
left: Join {
op: Inner,
condition: On(
BinaryOp {
left: ColumnRef {
database: None,
table: Some(
Ident {
value: "t2",
},
),
column: Ident {
value: "a",
},
},
op: Eq,
right: ColumnRef {
database: None,
table: Some(
Ident {
value: "t3",
},
),
column: Ident {
value: "a",
},
},
},
),
left: Subquery {
subquery: SelectStatement {
body: Select {
projection: [
Wildcard,
],
from: Some(
BaseTable {
name: TableName {
database: None,
table: Ident {
value: "t1",
},
},
alias: None,
},
),
selection: None,
group_by: [],
having: None,
},
order_by: [],
limit: None,
offset: None,
},
alias: Some(
Ident {
value: "t2",
},
),
},
right: BaseTable {
name: TableName {
database: None,
table: Ident {
value: "t3",
},
},
alias: None,
},
},
right: BaseTable {
name: TableName {
database: None,
table: Ident {
value: "t4",
},
},
alias: None,
},
},
),
selection: Some(
BinaryOp {
left: BinaryOp {
left: ColumnRef {
database: None,
table: None,
column: Ident {
value: "a",
},
},
op: Gt,
right: BinaryOp {
left: BinaryOp {
left: Literal(
UnsignedInteger(
1,
),
),
op: Add,
right: Literal(
UnsignedInteger(
2,
),
),
},
op: Mul,
right: Literal(
UnsignedInteger(
3,
),
),
},
},
op: And,
right: BinaryOp {
left: ColumnRef {
database: None,
table: None,
column: Ident {
value: "b",
},
},
op: Lt,
right: ColumnRef {
database: None,
table: None,
column: Ident {
value: "c",
},
},
},
},
),
group_by: [
ColumnRef {
database: None,
table: None,
column: Ident {
value: "a",
},
},
ColumnRef {
database: None,
table: None,
column: Ident {
value: "c",
},
},
],
having: Some(
BinaryOp {
left: Function {
name: Ident {
value: "count",
},
distinct: false,
args: [
Wildcard,
],
},
op: Gt,
right: Literal(
UnsignedInteger(
5,
),
),
},
),
},
order_by: [
OrderByExpr {
expr: ColumnRef {
database: None,
table: None,
column: Ident {
value: "a",
},
},
asc: None,
},
OrderByExpr {
expr: ColumnRef {
database: None,
table: None,
column: Ident {
value: "b",
},
},
asc: Some(
false,
),
},
],
limit: Some(
Literal(
UnsignedInteger(
1,
),
),
),
offset: Some(
Literal(
UnsignedInteger(
2,
),
),
),
}