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COMPAT.md

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SQLite Compatibility

This document describes the SQLite compatibility status of Limbo:

Limitations

  • Limbo does not support database access from multiple processes.

SQL statements

Statement Status Comment
ALTER TABLE No
ANALYZE No
ATTACH DATABASE No
BEGIN TRANSACTION No
COMMIT TRANSACTION No
CREATE INDEX No
CREATE TABLE Partial
CREATE TRIGGER No
CREATE VIEW No
CREATE VIRTUAL TABLE No
DELETE No
DETACH DATABASE No
DROP INDEX No
DROP TABLE No
DROP TRIGGER No
DROP VIEW No
END TRANSACTION No
EXPLAIN Yes
INDEXED BY No
INSERT Partial
ON CONFLICT clause No
PRAGMA Partial
PRAGMA cache_size Yes
REINDEX No
RELEASE SAVEPOINT No
REPLACE No
RETURNING clause No
ROLLBACK TRANSACTION No
SAVEPOINT No
SELECT Yes
SELECT ... WHERE Yes
SELECT ... WHERE ... LIKE Yes
SELECT ... LIMIT Yes
SELECT ... ORDER BY Yes
SELECT ... GROUP BY Yes
SELECT ... HAVING Yes
SELECT ... JOIN Yes
SELECT ... CROSS JOIN Yes SQLite CROSS JOIN means "do not reorder joins". We don't support that yet anyway.
SELECT ... INNER JOIN Yes
SELECT ... OUTER JOIN Partial no RIGHT JOIN
SELECT ... JOIN USING Yes
SELECT ... NATURAL JOIN Yes
UPDATE No
UPSERT No
VACUUM No
WITH clause No

SELECT Expressions

Feature support of sqlite expr syntax.

Syntax Status Comment
literals Yes
schema.table.column Partial Schemas aren't supported
unary operator Yes
binary operator Partial Only %, !<, and !> are unsupported
agg() FILTER (WHERE ...) No Is incorrectly ignored
... OVER (...) No Is incorrectly ignored
(expr) Yes
CAST (expr AS type) Yes
COLLATE No
(NOT) LIKE No
(NOT) GLOB No
(NOT) REGEXP No
(NOT) MATCH No
IS (NOT) No
IS (NOT) DISTINCT FROM No
(NOT) BETWEEN ... AND ... No
(NOT) IN (subquery) No
(NOT) EXISTS (subquery) No
CASE WHEN THEN ELSE END Yes
RAISE No

SQL functions

Scalar functions

Function Status Comment
abs(X) Yes
changes() No
char(X1,X2,...,XN) Yes
coalesce(X,Y,...) Yes
concat(X,...) Yes
concat_ws(SEP,X,...) Yes
format(FORMAT,...) No
glob(X,Y) Yes
hex(X) Yes
ifnull(X,Y) Yes
iif(X,Y,Z) Yes
instr(X,Y) Yes
last_insert_rowid() Yes
length(X) Yes
like(X,Y) No
like(X,Y,Z) No
likelihood(X,Y) No
likely(X) No
load_extension(X) No
load_extension(X,Y) No
lower(X) Yes
ltrim(X) Yes
ltrim(X,Y) Yes
max(X,Y,...) Yes
min(X,Y,...) Yes
nullif(X,Y) Yes
octet_length(X) Yes
printf(FORMAT,...) No
quote(X) Yes
random() Yes
randomblob(N) Yes
replace(X,Y,Z) Yes
round(X) Yes
round(X,Y) Yes
rtrim(X) Yes
rtrim(X,Y) Yes
sign(X) Yes
soundex(X) Yes
sqlite_compileoption_get(N) No
sqlite_compileoption_used(X) No
sqlite_offset(X) No
sqlite_source_id() No
sqlite_version() Yes
substr(X,Y,Z) Yes
substr(X,Y) Yes
substring(X,Y,Z) Yes
substring(X,Y) Yes
total_changes() No
trim(X) Yes
trim(X,Y) Yes
typeof(X) Yes
unhex(X) Yes
unhex(X,Y) Yes
unicode(X) Yes
unlikely(X) No
upper(X) Yes
zeroblob(N) Yes

Mathematical functions

Function Status Comment
acos(X) Yes
acosh(X) Yes
asin(X) Yes
asinh(X) Yes
atan(X) Yes
atan2(Y,X) Yes
atanh(X) Yes
ceil(X) Yes
ceiling(X) Yes
cos(X) Yes
cosh(X) Yes
degrees(X) Yes
exp(X) Yes
floor(X) Yes
ln(X) Yes
log(B,X) Yes
log(X) Yes
log10(X) Yes
log2(X) Yes
mod(X,Y) Yes
pi() Yes
pow(X,Y) Yes
power(X,Y) Yes
radians(X) Yes
sin(X) Yes
sinh(X) Yes
sqrt(X) Yes
tan(X) Yes
tanh(X) Yes
trunc(X) Yes

Aggregate functions

Function Status Comment
avg(X) Yes
count() Yes
count(*) Yes
group_concat(X) Yes
group_concat(X,Y) Yes
string_agg(X,Y) Yes
max(X) Yes
min(X) Yes
sum(X) Yes
total(X) Yes

Date and time functions

Function Status Comment
date() Yes partially supports modifiers
time() Yes partially supports modifiers
datetime() No
julianday() No
unixepoch() Partial does not support modifiers
strftime() No
timediff() No

JSON functions

Function Status Comment
json(json) Partial
jsonb(json)
json_array(value1,value2,...) Yes
jsonb_array(value1,value2,...)
json_array_length(json)
json_array_length(json,path)
json_error_position(json)
json_extract(json,path,...)
jsonb_extract(json,path,...)
json -> path
json ->> path
json_insert(json,path,value,...)
jsonb_insert(json,path,value,...)
json_object(label1,value1,...)
jsonb_object(label1,value1,...)
json_patch(json1,json2)
jsonb_patch(json1,json2)
json_pretty(json)
json_remove(json,path,...)
jsonb_remove(json,path,...)
json_replace(json,path,value,...)
jsonb_replace(json,path,value,...)
json_set(json,path,value,...)
jsonb_set(json,path,value,...)
json_type(json)
json_type(json,path)
json_valid(json)
json_valid(json,flags)
json_quote(value)
json_group_array(value)
jsonb_group_array(value)
json_group_object(label,value)
jsonb_group_object(name,value)
json_each(json)
json_each(json,path)
json_tree(json)
json_tree(json,path)

SQLite API

Interface Status Comment
sqlite3_open Partial
sqlite3_close Yes
sqlite3_prepare Partial
sqlite3_finalize Yes
sqlite3_step Yes
sqlite3_column_text Yes

SQLite VDBE opcodes

Opcode Status
Add Yes
AddImm No
Affinity No
AggFinal Yes
AggStep Yes
AggStep Yes
And No
AutoCommit No
BitAnd Yes
BitNot Yes
BitOr Yes
Blob Yes
Checkpoint No
Clear No
Close No
CollSeq No
Column Yes
Compare Yes
Concat No
Copy Yes
Count No
CreateIndex No
CreateTable No
DecrJumpZero Yes
Delete No
Destroy No
Divide Yes
DropIndex No
DropTable No
DropTrigger No
EndCoroutine Yes
Eq Yes
Expire No
Explain No
FkCounter No
FkIfZero No
Found No
Function Yes
Ge Yes
Gosub Yes
Goto Yes
Gt Yes
Halt Yes
HaltIfNull No
IdxDelete No
IdxGE Yes
IdxInsert No
IdxLT No
IdxRowid No
If Yes
IfNeg No
IfNot Yes
IfPos Yes
IfZero No
IncrVacuum No
Init Yes
InitCoroutine Yes
Insert No
InsertAsync Yes
InsertAwait Yes
InsertInt No
Int64 No
Integer Yes
IntegrityCk No
IsNull Yes
IsUnique No
JournalMode No
Jump Yes
Last No
Le Yes
LoadAnalysis No
Lt Yes
MakeRecord Yes
MaxPgcnt No
MemMax No
Move No
Multiply Yes
MustBeInt Yes
Ne Yes
NewRowid Yes
Next No
NextAsync Yes
NextAwait Yes
Noop No
Not No
NotExists Yes
NotFound No
NotNull Yes
Null Yes
NullRow Yes
Once No
OpenAutoindex No
OpenEphemeral No
OpenPseudo Yes
OpenRead Yes
OpenReadAsync Yes
OpenWrite No
OpenWriteAsync Yes
OpenWriteAwait Yes
Or No
Pagecount No
Param No
ParseSchema No
Permutation No
Prev No
PrevAsync Yes
PrevAwait Yes
Program No
ReadCookie No
Real Yes
RealAffinity Yes
Remainder No
ResetCount No
ResultRow Yes
Return Yes
Rewind Yes
RewindAsync Yes
RewindAwait Yes
RowData No
RowId Yes
RowKey No
RowSetAdd No
RowSetRead No
RowSetTest No
Rowid Yes
SCopy No
Savepoint No
Seek No
SeekGe Yes
SeekGt Yes
SeekLe No
SeekLt No
SeekRowid Yes
Sequence No
SetCookie No
ShiftLeft No
ShiftRight No
SoftNull Yes
Sort No
SorterCompare No
SorterData Yes
SorterInsert Yes
SorterNext Yes
SorterOpen Yes
SorterSort Yes
String No
String8 Yes
Subtract Yes
TableLock No
ToBlob No
ToInt No
ToNumeric No
ToReal No
ToText No
Trace No
Transaction Yes
VBegin No
VColumn No
VCreate No
VDestroy No
VFilter No
VNext No
VOpen No
VRename No
VUpdate No
Vacuum No
Variable No
VerifyCookie No
Yield Yes
LibSql Compatibility / Extensions
UUID UUID's in limbo are blobs by default
uuid4() Yes uuid version 4
uuid4_str() Yes uuid v4 string alias gen_random_uuid() for PG compatibility
uuid7(X?) Yes uuid version 7, Optional arg for seconds since epoch
uuid7_timestamp_ms(X) Yes Convert a uuid v7 to milliseconds since epoch
uuid_str(X) Yes Convert a valid uuid to string
uuid_blob(X) Yes Convert a valid uuid to blob