[sql] [bug]修复了CreateSchema和DropSchemaDDL 构造的字符串化,当没有方言时会导致AttributeError。 引用:#7664 [sql] [bug]修复了临界的 SQL 缓存问题,其中使用Operators.op()自定义运算符函数不会生成适当的缓存键,导致 SQL 缓存的效果降低。 引用:#9506 mypy [mypy] [bug]调整了 mypy 插件,以适应在使用...
freeze(), inserted_primary_key, inserted_primary_key_rows, is_insert, keys(), last_inserted_params(), last_updated_params(), lastrow_has_defaults(), lastrowid, mappings(), merge(), one(), one_or_none(), partitions(), postfetch_cols(), prefetch_cols(), returned_defaults, returned_de...
SELECT class, wm_concat(distinct ',', name) as names FROM students GROUP BY class; 说明 wm_concat是字符拼接函数,详情请参见WM_CONCAT。 输出结果如下。 class names 1 LiLei,HanMM,Jim 2 Kate,Peter 示例2:统计不同class对应的男女人数。 SELECT class ,SUM(CASE WHEN gender = 'M' THEN 1 ...
You can breakdown a complex query and create multiple temporary tables. Then you can run “sanity check” queries against those tables to make sure they contain correct entries. I highly recommend this approach when designing a new non-trivial query or report. 代码语言:javascript 代码运行次数:0 ...
The Database Engine raises an error and the delete action on the row in the parent table is rolled back. CASCADE Corresponding rows are deleted from the referencing table if that row is deleted from the parent table. SET NULL All the values that make up the foreign key are set to NULL ...
create database if not exists Test; 使用if not exists子语句以避免创建存在的数据库时,出现MySQL错误信息 MariaDB [(none)]> create database if not exists Test; Query OK, 1 row affected (0.00 sec) show databases; 查看数据库 MariaDB [(none)]> show databases; ...
The integer value to be assigned to the first row in the table. increment The integer value to add to the seed value for successive rows in the table. <column_constraint> ::= and ::= Defines the constraint for a specified column or table. For CLR functions, the only constraint type...
*/publicvoideval(Object rowKey)throwsIOException {if(cache !=null) {RowDatacacheRowData=cache.getIfPresent(rowKey);if(cacheRowData !=null) { collect(cacheRowData);return; } }for(intretry=0; retry <= maxRetryTimes; retry++) {try{// fetch resultGetget=serde.createGet(rowKey);if(get !
Copy same data into multiple rows copy stored procedures from one schema to another in a sql server database through batch Copy table from one server to another Copy table Structure including primary keys, index etc. Copy tables with all constraints Correct way to run multiple sql scripts from...
The integer value to be assigned to the first row in the table. increment The integer value to add to the seed value for successive rows in the table. <column_constraint> ::= and ::= Defines the constraint for a specified column or table. For CLR functions, the only constraint type...