fix: mysql migration: make sure the indices sql which left-join be th…

…e same database (typeorm#6426)

src/driver/mysql/MysqlQueryRunner.ts

@@ -1218,7 +1218,7 @@ export class MysqlQueryRunner extends BaseQueryRunner implements QueryRunner {
             return `(\`s\`.\`TABLE_SCHEMA\` = '${database}' AND \`s\`.\`TABLE_NAME\` = '${name}')`;
         }).join(" OR ");
         const indicesSql = `SELECT \`s\`.* FROM \`INFORMATION_SCHEMA\`.\`STATISTICS\` \`s\` ` +
-            `LEFT JOIN \`INFORMATION_SCHEMA\`.\`REFERENTIAL_CONSTRAINTS\` \`rc\` ON \`s\`.\`INDEX_NAME\` = \`rc\`.\`CONSTRAINT_NAME\` ` +
+            `LEFT JOIN \`INFORMATION_SCHEMA\`.\`REFERENTIAL_CONSTRAINTS\` \`rc\` ON \`s\`.\`INDEX_NAME\` = \`rc\`.\`CONSTRAINT_NAME\` AND \`s\`.\`TABLE_SCHEMA\` = \`rc\`.\`CONSTRAINT_SCHEMA\`` +
             `WHERE (${indicesCondition}) AND \`s\`.\`INDEX_NAME\` != 'PRIMARY' AND \`rc\`.\`CONSTRAINT_NAME\` IS NULL`;
 
         const foreignKeysCondition = tableNames.map(tableName => {