diff --git a/src/data/constants.js b/src/data/constants.js
index c7cb448..b07605e 100644
--- a/src/data/constants.js
+++ b/src/data/constants.js
@@ -109,7 +109,7 @@ export const SIDESHEET = {
 export const DB = {
   MYSQL: "mysql",
   POSTGRES: "postgresql",
-  MSSQL: "mssql",
+  MSSQL: "transactsql",
   SQLITE: "sqlite",
   MARIADB: "mariadb",
   GENERIC: "generic",
diff --git a/src/data/datatypes.js b/src/data/datatypes.js
index f920e8e..77c0cd7 100644
--- a/src/data/datatypes.js
+++ b/src/data/datatypes.js
@@ -1,4 +1,5 @@
 import { strHasQuotes } from "../utils/utils";
+import { DB } from "./constants";
 
 const intRegex = /^-?\d*$/;
 const doubleRegex = /^-?\d*.?\d+$/;
@@ -1616,12 +1617,12 @@ export const mssqlTypes = new Proxy(mssqlTypesBase, {
 });
 
 const dbToTypesBase = {
-  generic: defaultTypes,
-  mysql: mysqlTypes,
-  postgresql: postgresTypes,
-  sqlite: sqliteTypes,
-  mssql: mssqlTypes,
-  mariadb: mysqlTypes,
+  [DB.GENERIC]: defaultTypes,
+  [DB.MYSQL]: mysqlTypes,
+  [DB.POSTGRES]: postgresTypes,
+  [DB.SQLITE]: sqliteTypes,
+  [DB.MSSQL]: mssqlTypes,
+  [DB.MARIADB]: mysqlTypes,
 };
 
 export const dbToTypes = new Proxy(dbToTypesBase, {
diff --git a/src/utils/importSQL/index.js b/src/utils/importSQL/index.js
index 4bf1951..30974ec 100644
--- a/src/utils/importSQL/index.js
+++ b/src/utils/importSQL/index.js
@@ -5,6 +5,7 @@ import {
   tableHeaderHeight,
 } from "../../data/constants";
 import { fromMariaDB } from "./mariadb";
+import { fromMSSQL } from "./mssql";
 import { fromMySQL } from "./mysql";
 import { fromPostgres } from "./postgres";
 import { fromSQLite } from "./sqlite";
@@ -25,7 +26,7 @@ export function importSQL(ast, toDb = DB.MYSQL, diagramDb = DB.GENERIC) {
       diagram = fromMariaDB(ast, diagramDb);
       break;
     case DB.MSSQL:
-      diagram = { tables: [], relationships: [] };
+      diagram = fromMSSQL(ast, diagramDb);
       break;
     default:
       diagram = { tables: [], relationships: [] };
diff --git a/src/utils/importSQL/mssql.js b/src/utils/importSQL/mssql.js
new file mode 100644
index 0000000..4d8efef
--- /dev/null
+++ b/src/utils/importSQL/mssql.js
@@ -0,0 +1,270 @@
+import { Cardinality, DB } from "../../data/constants";
+import { dbToTypes } from "../../data/datatypes";
+import { buildSQLFromAST } from "./shared";
+
+const affinity = {
+  [DB.MSSQL]: new Proxy(
+    { INT: "INTEGER" },
+    { get: (target, prop) => (prop in target ? target[prop] : "TEXT") },
+  ),
+  [DB.GENERIC]: new Proxy(
+    {
+      INT: "INTEGER",
+      TINYINT: "SMALLINT",
+      MEDIUMINT: "INTEGER",
+      BIT: "BOOLEAN",
+      DATETIME2: "DATETIME",
+      MONEY: "NUMERIC",
+      SMALLMONEY: "NUMERIC",
+      NCHAR: "CHAR",
+      NVARCHAR: "VARCHAR",
+      NTEXT: "TEXT",
+      IMAGE: "BLOB",
+      XML: "BLOB",
+      DATETIMEOFFSET: "TEXT",
+      SQL_VARIANT: "TEXT",
+      UNIQUEIDENTIFIER: "UUID",
+      SMALLDATETIME: "DATETIME",
+      CURSOR: "BLOB",
+    },
+    { get: (target, prop) => (prop in target ? target[prop] : "TEXT") },
+  ),
+};
+
+export function fromMSSQL(ast, diagramDb = DB.GENERIC) {
+  const tables = [];
+  const relationships = [];
+
+  const parseSingleStatement = (e) => {
+    if (e.type === "create") {
+      if (e.keyword === "table") {
+        const table = {};
+        table.name = e.table[0].table;
+        table.comment = "";
+        table.color = "#175e7a";
+        table.fields = [];
+        table.indices = [];
+        table.id = tables.length;
+        e.create_definitions.forEach((d) => {
+          if (d.resource === "column") {
+            const field = {};
+            field.name = d.column.column;
+
+            let type = d.definition.dataType;
+            if (!dbToTypes[diagramDb][type]) {
+              type = affinity[diagramDb][type];
+            }
+            field.type = type;
+
+            if (d.definition.expr && d.definition.expr.type === "expr_list") {
+              field.values = d.definition.expr.value.map((v) => v.value);
+            }
+            field.comment = "";
+            field.unique = false;
+            if (d.unique) field.unique = true;
+            field.increment = false;
+            if (d.auto_increment) field.increment = true;
+            field.notNull = false;
+            if (d.nullable) field.notNull = true;
+            field.primary = false;
+            if (d.primary_key) field.primary = true;
+            field.default = "";
+            if (d.default_val) {
+              let defaultValue = "";
+              if (d.default_val.value.type === "function") {
+                defaultValue = d.default_val.value.name.name[0].value;
+                if (d.default_val.value.args) {
+                  defaultValue +=
+                    "(" +
+                    d.default_val.value.args.value
+                      .map((v) => {
+                        if (
+                          v.type === "single_quote_string" ||
+                          v.type === "double_quote_string"
+                        )
+                          return "'" + v.value + "'";
+                        return v.value;
+                      })
+                      .join(", ") +
+                    ")";
+                }
+              } else if (d.default_val.value.type === "null") {
+                defaultValue = "NULL";
+              } else {
+                defaultValue = d.default_val.value.value.toString();
+              }
+              field.default = defaultValue;
+            }
+            if (d.definition["length"]) {
+              if (d.definition.scale) {
+                field.size = d.definition["length"] + "," + d.definition.scale;
+              } else {
+                field.size = d.definition["length"];
+              }
+            }
+            field.check = "";
+            if (d.check) {
+              field.check = buildSQLFromAST(d.check.definition[0]);
+            }
+
+            table.fields.push(field);
+          } else if (d.resource === "constraint") {
+            if (d.constraint_type === "primary key") {
+              d.definition.forEach((c) => {
+                table.fields.forEach((f) => {
+                  if (f.name === c.column && !f.primary) {
+                    f.primary = true;
+                  }
+                });
+              });
+            } else if (d.constraint_type === "FOREIGN KEY") {
+              const relationship = {};
+              const startTableId = table.id;
+              const startTable = e.table[0].table;
+              const startField = d.definition[0].column;
+              const endTable = d.reference_definition.table[0].table;
+              const endField = d.reference_definition.definition[0].column;
+
+              const endTableId = tables.findIndex((t) => t.name === endTable);
+              if (endTableId === -1) return;
+
+              const endFieldId = tables[endTableId].fields.findIndex(
+                (f) => f.name === endField,
+              );
+              if (endField === -1) return;
+
+              const startFieldId = table.fields.findIndex(
+                (f) => f.name === startField,
+              );
+              if (startFieldId === -1) return;
+
+              relationship.name = startTable + "_" + startField + "_fk";
+              relationship.startTableId = startTableId;
+              relationship.endTableId = endTableId;
+              relationship.endFieldId = endFieldId;
+              relationship.startFieldId = startFieldId;
+              let updateConstraint = "No action";
+              let deleteConstraint = "No action";
+              d.reference_definition.on_action.forEach((c) => {
+                if (c.type === "on update") {
+                  updateConstraint = c.value.value;
+                  updateConstraint =
+                    updateConstraint[0].toUpperCase() +
+                    updateConstraint.substring(1);
+                } else if (c.type === "on delete") {
+                  deleteConstraint = c.value.value;
+                  deleteConstraint =
+                    deleteConstraint[0].toUpperCase() +
+                    deleteConstraint.substring(1);
+                }
+              });
+
+              relationship.updateConstraint = updateConstraint;
+              relationship.deleteConstraint = deleteConstraint;
+              relationship.cardinality = Cardinality.ONE_TO_ONE;
+              relationships.push(relationship);
+            }
+          }
+        });
+        table.fields.forEach((f, j) => {
+          f.id = j;
+        });
+        tables.push(table);
+      } else if (e.keyword === "index") {
+        const index = {};
+        index.name = e.index;
+        index.unique = false;
+        if (e.index_type === "unique") index.unique = true;
+        index.fields = [];
+        e.index_columns.forEach((f) => index.fields.push(f.column));
+
+        let found = -1;
+        tables.forEach((t, i) => {
+          if (found !== -1) return;
+          if (t.name === e.table.table) {
+            t.indices.push(index);
+            found = i;
+          }
+        });
+
+        if (found !== -1) tables[found].indices.forEach((i, j) => (i.id = j));
+      }
+    } else if (e.type === "alter") {
+      e.expr.forEach((expr) => {
+        if (
+          expr.action === "add" &&
+          expr.create_definitions.constraint_type === "FOREIGN KEY"
+        ) {
+          const relationship = {};
+          const startTable = e.table[0].table;
+          const startField = expr.create_definitions.definition[0].column;
+          const endTable =
+            expr.create_definitions.reference_definition.table[0].table;
+          const endField =
+            expr.create_definitions.reference_definition.definition[0].column;
+          let updateConstraint = "No action";
+          let deleteConstraint = "No action";
+          expr.create_definitions.reference_definition.on_action.forEach(
+            (c) => {
+              if (c.type === "on update") {
+                updateConstraint = c.value.value;
+                updateConstraint =
+                  updateConstraint[0].toUpperCase() +
+                  updateConstraint.substring(1);
+              } else if (c.type === "on delete") {
+                deleteConstraint = c.value.value;
+                deleteConstraint =
+                  deleteConstraint[0].toUpperCase() +
+                  deleteConstraint.substring(1);
+              }
+            },
+          );
+
+          const startTableId = tables.findIndex((t) => t.name === startTable);
+          if (startTable === -1) return;
+
+          const endTableId = tables.findIndex((t) => t.name === endTable);
+          if (endTableId === -1) return;
+
+          const endFieldId = tables[endTableId].fields.findIndex(
+            (f) => f.name === endField,
+          );
+          if (endField === -1) return;
+
+          const startFieldId = tables[startTableId].fields.findIndex(
+            (f) => f.name === startField,
+          );
+          if (startFieldId === -1) return;
+
+          relationship.name = startTable + "_" + startField + "_fk";
+          relationship.startTableId = startTableId;
+          relationship.startFieldId = startFieldId;
+          relationship.endTableId = endTableId;
+          relationship.endFieldId = endFieldId;
+          relationship.updateConstraint = updateConstraint;
+          relationship.deleteConstraint = deleteConstraint;
+          relationship.cardinality = Cardinality.ONE_TO_ONE;
+          relationships.push(relationship);
+
+          relationships.forEach((r, i) => (r.id = i));
+        }
+      });
+    }
+  };
+
+  if (ast.go_next) {
+    let x = { ...ast };
+    let done = Array.isArray(x.go_next);
+    while (!done) {
+      parseSingleStatement(x.ast);
+      x = { ...x.go_next };
+      done = Array.isArray(x.go_next);
+    }
+  } else if (Array.isArray(ast)) {
+    ast.forEach((e) => {
+      parseSingleStatement(e);
+    });
+  }
+
+  return { tables, relationships };
+}