Hi, i'm trying to retrieve requirements from a locally stored repository. The idea was, to retrieve the requirements hierarchy by selecting the parent object id (if any) via an existing relationship for each requirement. I tried to use the following SQL query: select o.Object_ID, o.Name, ...
Select 1 "PLAYER_ID", 1 "TEAM_ID", 'Pitcher' "POSITION", 70000 "SALARY", Null "BONUS" From Dual Union All Select 2 "PLAYER_ID", 1 "TEAM_ID", 'notPitcher' "POSITION", 62000 "SALARY", Null "BONUS" From Dual Union All Select 3 "PLAYER_ID", 1 "TEAM_ID", 'PitcherToo' "POSI...
Query 2：不等值 Join select count(*) from mse_test, nbar_test where mse_test.client_key = nbar_test.client_keyandmse_test.client_key between 100000 and 300000;Query 2 Test 1：强制使用 Hash Join，失败 本次实验通过设置 enable_hashjoin=true ， enable_nestloop=false ...
select name from person where countryid in ( select countryid from country where countryname = '魏国' ) 1. 2. 3. 4. 5. 6. 输出结果为: 五、some嵌套查询 1、语法 some在sql中的逻辑运算符号,如果在一系列比较中,有些值为True,那么结果就为True。some的语法是: <表达式>{ =|<>|!=|>|>=|...
SELECTcurrent_setting('enable_memoize');|current_setting||---||on| 整个特性已开启,看下explain: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 EXPLAINSELECT*FROMtJOINuONt.j=u.j;|QUERYPLAN||---||NestedLoop(cost=0.30..8945.41rows=496032width=16)||->Seq Scan ont(cost=0.00..1443.00rows...
Simple Query (one field) In order to query a nested field all you need to do is add the "nested" function on the field. SELECT * FROM myIndex where nested(comments.message)='hello' 查询嵌套字段 简单查询(一个字段) 为了查询嵌套字段,你需要做的就是在字段上添加“嵌套”函数。
使用SQL 日志查看实际生成的 SQL 语句,并手动在数据库中运行以检查错误。 调整SQL 查询语句以符合数据库的 SQL 语法规范。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // 错误的 JPQL 查询@Query("SELECT m FROM MyEntity m WHERE m.invalidField = ?1")List<MyEntity>findByInvalidField(String va...
=> EXPLAIN (analyze, timing off, summary off) SELECT * FROM tickets t JOIN ticket_flights tf ON tf.ticket_no = t.ticket_no WHERE t.book_ref = '03A76D'; QUERY PLAN −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−...
SELECT Statements Filtering Sorting Grouping JOIN Subquery Subquery Nested by WHERE Subquery Nested by FROM Subquery Nested by HAVING Multi-Layer Nested Subquery Alias Set Operations WITH...AS CASE...WHEN OVER Clause Flink OpenSource SQL 1.12 Syntax Reference Flink Opensource SQL 1.10 Syntax Reference ...
SELECTcurrent_setting('enable_memoize');|current_setting||---||on 整个特性已开启,看下explain: EXPLAINSELECT *FROM t JOIN u ON t.j = u.j;|QUERY PLAN ||---||Nested Loop (cost=0.30..8945.41 rows=496032 width=16) || -> Seq Scan on t (cost=0.00..1443.00 rows=100000 width=8) |...