diff --git a/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js b/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js
index 897f8e9..14a708c 100644
--- a/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js
+++ b/forward_engineering/alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper.js
@@ -42,12 +42,11 @@ const getModifyNonNullColumnsScriptDtos = ({ scriptFormat, collection }) => {
 			const scripts = [];
 
 			if (isOldRequired && (!isNewRequired || isNameChanged)) {
-				const template = oldConstraintName ? templates.dropConstraint : templates.alterNullableConstraint;
 				scripts.push(
 					AlterScriptDto.getInstance(
-						assignTemplates(template, { ...scriptParams, constraintName: prepareName(oldConstraintName) }),
+						assignTemplates(templates.alterNullableConstraint, scriptParams),
 						true,
-						Boolean(templates.dropConstraint),
+						false,
 						SCRIPT_TYPE.alterEntity,
 					),
 				);
@@ -74,33 +73,12 @@ const getModifyNonNullColumnsScriptDtos = ({ scriptFormat, collection }) => {
 	return addNotNullConstraintsScript;
 };
 
-const createNotNullConstraintScript = ({ scriptFormat, constraintName, columnName }) => {
-	const prepareName = prepareNameForScriptFormat(scriptFormat);
-	return assignTemplates(templates.notNullConstraint, {
-		constraintName: prepareName(constraintName),
-		columnName: prepareName(columnName),
-	});
-};
-
 /**
- * Get named NOT NULL constraints data
- * @param {object} jsonSchema
- * @param {string} scriptFormat
+ * Column-level named NOT NULL constraints are emitted inline on the column definition.
  * @returns {Array<{ statement: string, isActivated: boolean }>}
  */
-const getNotNullConstraints = (jsonSchema, scriptFormat) => {
-	return _.toPairs(jsonSchema.properties)
-		.filter(
-			([name, columnSchema]) => jsonSchema.required?.includes(name) && columnSchema.notNullConstraintName?.trim(),
-		)
-		.map(([name, columnSchema]) => ({
-			statement: createNotNullConstraintScript({
-				scriptFormat,
-				constraintName: columnSchema.notNullConstraintName,
-				columnName: name,
-			}),
-			isActivated: columnSchema.isActivated,
-		}));
+const getNotNullConstraints = () => {
+	return [];
 };
 
 module.exports = {
diff --git a/forward_engineering/ddlProvider/ddlHelpers/columnDefinitionHelper.js b/forward_engineering/ddlProvider/ddlHelpers/columnDefinitionHelper.js
index 7b69902..74902d3 100644
--- a/forward_engineering/ddlProvider/ddlHelpers/columnDefinitionHelper.js
+++ b/forward_engineering/ddlProvider/ddlHelpers/columnDefinitionHelper.js
@@ -30,14 +30,34 @@ module.exports = ({ assignTemplates, templates, commentIfDeactivated, wrapCommen
 			.value();
 	};
 
-	const getColumnConstraints = ({ nullable, unique, primaryKey, primaryKeyOptions, uniqueKeyOptions }) => {
+	const getNotNullString = ({ nullable, primaryKey, notNullConstraintName }) => {
+		if (nullable || primaryKey) {
+			return '';
+		}
+
+		if (notNullConstraintName?.trim()) {
+			const { constraintString } = getOptionsString({ constraintName: notNullConstraintName });
+			return ` ${constraintString}NOT NULL`;
+		}
+
+		return ' NOT NULL';
+	};
+
+	const getColumnConstraints = ({
+		nullable,
+		unique,
+		primaryKey,
+		primaryKeyOptions,
+		uniqueKeyOptions,
+		notNullConstraintName,
+	}) => {
 		const { constraintString, statement } = getOptionsString(
 			getOptions({ primaryKey, unique, primaryKeyOptions, uniqueKeyOptions }),
 		);
 		const primaryKeyString = primaryKey ? ` PRIMARY KEY` : '';
 		const uniqueKeyString = unique ? ` UNIQUE` : '';
-		const nullableString = nullable || primaryKey ? '' : ' NOT NULL';
-		return `${nullableString}${constraintString}${primaryKeyString}${uniqueKeyString}${statement}`;
+		const notNullString = getNotNullString({ nullable, primaryKey, notNullConstraintName });
+		return `${notNullString}${constraintString}${primaryKeyString}${uniqueKeyString}${statement}`;
 	};
 
 	const getOptions = ({ primaryKey, unique, primaryKeyOptions, uniqueKeyOptions }) => {
diff --git a/forward_engineering/ddlProvider/ddlProvider.js b/forward_engineering/ddlProvider/ddlProvider.js
index 78f58ef..d346ebb 100644
--- a/forward_engineering/ddlProvider/ddlProvider.js
+++ b/forward_engineering/ddlProvider/ddlProvider.js
@@ -23,11 +23,13 @@ const {
 	wrapComment,
 	getColumnsList,
 	prepareNameForScriptFormat,
+	toArray,
 } = require('../utils/general');
 const { getAnnotationsString } = require('../utils/getAnnotationsString');
 const { assignTemplates } = require('../utils/assignTemplates');
 const { decorateType } = require('./ddlHelpers/columnDefinitionHelpers/decorateType');
 const { getNotNullConstraints } = require('../alterScript/alterScriptHelpers/columnHelpers/nonNullConstraintHelper');
+const keyHelper = require('./ddlHelpers/keyHelper')(clean);
 
 /**
  * @param dbVersion {string} DB version in "21ai" format
@@ -38,15 +40,11 @@ const shouldUseTryCatchIfNotExistsWrapper = dbVersion => {
 	return dbVersionAsNumber < DbVersion.IF_NOT_EXISTS_SINCE;
 };
 
-module.exports = (baseProvider, options, app) => {
-	const toArray = val => (_.isArray(val) ? val : [val]);
-
+const ddlProvider = (baseProvider, options, app) => {
 	const scriptFormat = options?.targetScriptOptions?.keyword;
 	const prepareName = prepareNameForScriptFormat(scriptFormat);
 	const getNamePrefixedWithSchemaName = getNamePrefixedWithSchemaNameForScriptFormat(scriptFormat);
 
-	const keyHelper = require('./ddlHelpers/keyHelper')(clean);
-
 	const { getColumnComments, getColumnConstraints, replaceTypeByVersion, getColumnDefault, getColumnEncrypt } =
 		require('./ddlHelpers/columnDefinitionHelper.js')({
 			wrap,
@@ -193,7 +191,8 @@ module.exports = (baseProvider, options, app) => {
 				primaryKeyOptions: jsonSchema.primaryKeyOptions,
 				unique: keyHelper.isInlineUnique(jsonSchema),
 				uniqueKeyOptions: jsonSchema.uniqueKeyOptions,
-				nullable: columnDefinition.nullable || Boolean(jsonSchema.notNullConstraintName?.trim()),
+				nullable: columnDefinition.nullable,
+				notNullConstraintName: jsonSchema.notNullConstraintName,
 				default: columnDefinition.default,
 				comment: jsonSchema.refDescription || jsonSchema.description || definitionJsonSchema.description,
 				isActivated: columnDefinition.isActivated,
@@ -354,7 +353,7 @@ module.exports = (baseProvider, options, app) => {
 
 		/**
 		 * @param tableName {string}
-		 * @param fkConstraintName {string}
+		 * @param constraintName {string}
 		 * @return string
 		 * */
 		dropForeignKey(tableName, constraintName) {
@@ -375,7 +374,7 @@ module.exports = (baseProvider, options, app) => {
 				keyConstraints: keyHelper.getTableKeyConstraints(jsonSchema),
 				notNullConstraints: getNotNullConstraints(jsonSchema, scriptFormat),
 				selectStatement: _.trim(detailsTab.selectStatement),
-				partitioning: _.assign({}, partitioning, { compositePartitionKey }),
+				partitioning: { ...partitioning, compositePartitionKey },
 				..._.pick(
 					detailsTab,
 					'blockchain_table_clauses',
@@ -792,3 +791,5 @@ module.exports = (baseProvider, options, app) => {
 		},
 	};
 };
+
+module.exports = ddlProvider;
diff --git a/forward_engineering/ddlProvider/templates.js b/forward_engineering/ddlProvider/templates.js
index 7e9feea..2b43b4e 100644
--- a/forward_engineering/ddlProvider/templates.js
+++ b/forward_engineering/ddlProvider/templates.js
@@ -87,8 +87,7 @@ module.exports = {
 
 	alterNotNullConstraint: 'ALTER TABLE ${tableName} MODIFY ${columnName} NOT NULL;',
 
-	alterNamedNotNullConstraint:
-		'ALTER TABLE ${tableName} ADD CONSTRAINT ${constraintName} CHECK (${columnName} IS NOT NULL);',
+	alterNamedNotNullConstraint: 'ALTER TABLE ${tableName} MODIFY ${columnName} CONSTRAINT ${constraintName} NOT NULL;',
 
 	alterNullableConstraint: 'ALTER TABLE ${tableName} MODIFY ${columnName} NULL;',
 
diff --git a/forward_engineering/utils/general.js b/forward_engineering/utils/general.js
index b817844..52e0820 100644
--- a/forward_engineering/utils/general.js
+++ b/forward_engineering/utils/general.js
@@ -237,6 +237,8 @@ const getId = entity => entity.id || entity.role.id;
 
 const normalizeLineEndings = str => str.replaceAll('\r\n', '\n');
 
+const toArray = val => (Array.isArray(val) ? val : [val]);
+
 module.exports = {
 	getDbName,
 	getBucketName,
@@ -268,4 +270,5 @@ module.exports = {
 	isParentContainerActivated,
 	getId,
 	normalizeLineEndings,
+	toArray,
 };