diff --git a/src/DDLQueryBuilder.php b/src/DDLQueryBuilder.php
index f812754c..10221199 100644
--- a/src/DDLQueryBuilder.php
+++ b/src/DDLQueryBuilder.php
@@ -53,7 +53,7 @@ public function addCommentOnColumn(string $table, string $column, string $commen
             . $this->quoter->quoteColumnName($column)
             . ' '
             . $this->quoter->quoteColumnName($column)
-            . (empty($definition) ? '' : ' ' . $definition)
+            . ($definition === '' ? '' : ' ' . $definition)
             . ' COMMENT '
             . (string) $this->quoter->quoteValue($comment);
 
@@ -84,7 +84,7 @@ public function createIndex(
         string $indexType = null,
         string $indexMethod = null
     ): string {
-        return 'CREATE ' . ($indexType ? ($indexType . ' ') : '') . 'INDEX '
+        return 'CREATE ' . ($indexType !== null ? "$indexType " : '') . 'INDEX '
             . $this->quoter->quoteTableName($name)
             . ($indexMethod !== null ? " USING $indexMethod" : '')
             . ' ON ' . $this->quoter->quoteTableName($table)
@@ -173,21 +173,18 @@ public function renameColumn(string $table, string $oldName, string $newName): s
      */
     public function getColumnDefinition(string $table, string $column): string
     {
-        $result = '';
         $sql = $this->schema->getTableSchema($table)?->getCreateSql();
 
-        if (empty($sql)) {
+        if ($sql === null) {
             return '';
         }
 
-        if (preg_match_all('/^\s*([`"])(.*?)\\1\s+(.*?),?$/m', $sql, $matches)) {
-            foreach ($matches[2] as $i => $c) {
-                if ($c === $column) {
-                    $result = $matches[3][$i];
-                }
-            }
+        $quotedColumn = preg_quote($column, '/');
+
+        if (preg_match("/^\s*([`\"])$quotedColumn\\1\s+(.*?),?$/m", $sql, $matches) !== 1) {
+            return '';
         }
 
-        return $result;
+        return $matches[2];
     }
 }
diff --git a/src/DMLQueryBuilder.php b/src/DMLQueryBuilder.php
index 516b76aa..28806500 100644
--- a/src/DMLQueryBuilder.php
+++ b/src/DMLQueryBuilder.php
@@ -79,6 +79,7 @@ public function upsert(
             }
         }
 
+        /** @psalm-suppress RiskyTruthyFalsyComparison */
         if (empty($updateColumns)) {
             return str_replace('INSERT INTO', 'INSERT IGNORE INTO', $insertSql);
         }
@@ -107,7 +108,7 @@ public function upsert(
      */
     protected function prepareInsertValues(string $table, QueryInterface|array $columns, array $params = []): array
     {
-        if (empty($columns)) {
+        if ($columns === []) {
             return [[], [], 'VALUES ()', []];
         }
 
diff --git a/src/Schema.php b/src/Schema.php
index e6e9b5b3..072bdfb4 100644
--- a/src/Schema.php
+++ b/src/Schema.php
@@ -66,7 +66,7 @@
  *   key: string,
  *   default: string|null,
  *   extra: string,
- *   extra_default_value: string|null,
+ *   extra_default_value: string,
  *   privileges: string,
  *   comment: string
  * }
@@ -161,7 +161,7 @@ public function findUniqueIndexes(TableSchemaInterface $table): array
         $uniqueIndexes = [];
         $regexp = '/UNIQUE KEY\s+[`"](.+)[`"]\s*\(([`"].+[`"])+\)/mi';
 
-        if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
+        if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER) > 0) {
             foreach ($matches as $match) {
                 $indexName = $match[1];
                 $indexColumns = array_map('trim', preg_split('/[`"],[`"]/', trim($match[2], '`"')));
@@ -529,7 +529,7 @@ protected function loadColumnSchema(array $info): ColumnSchemaInterface
         $extra = $info['extra'];
         if (
             empty($extra)
-            && !empty($info['extra_default_value'])
+            && $info['extra_default_value'] !== ''
             && !str_starts_with($info['extra_default_value'], '\'')
             && in_array($column->getType(), [
                 self::TYPE_CHAR, self::TYPE_STRING, self::TYPE_TEXT,
@@ -575,7 +575,7 @@ private function normalizeDefaultValue(?string $defaultValue, ColumnSchemaInterf
             return new Expression('CURRENT_TIMESTAMP' . (!empty($matches[1]) ? '(' . $matches[1] . ')' : ''));
         }
 
-        if (!empty($column->getExtra()) && !empty($defaultValue)) {
+        if ($defaultValue !== '' && $column->getExtra() !== '') {
             return new Expression($defaultValue);
         }
 
@@ -927,7 +927,7 @@ private function getJsonColumns(TableSchemaInterface $table): array
         $result = [];
         $regexp = '/json_valid\([\`"](.+)[\`"]\s*\)/mi';
 
-        if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
+        if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER) > 0) {
             foreach ($matches as $match) {
                 $result[] = $match[1];
             }