FIELD() 返回值在值列表中的索引位置 FIND_IN_SET(str,list) 分析逗号分隔的list列表,如果发现str,返回str在list中的位置 QUOTE(str) quote_literal() 用反斜杠转义str中的单引号 SUBSTRING_INDEX() split_part() 在出现指定数量的分隔符之前返回字符串的子字符串 STRCMP(s1,s2) = 比较字符串s1和s2 UCASE(...
SELECT GROUP_CONCAT(depid) INTO cTemp from fw_department WHERE FIND_IN_SET(PARENTDEPID,cTemp)>0; END WHILE; RETURN pTemp; END; -- 查询部门ID为‘1111’的所有子部门(包含自己) select * from fw_department where FIND_IN_SET(DEPID, fun_getDepIDList('1111')); -- 查询部门ID为‘1111’...
| find_in_set('','a,b,c,dx') | | = 0 | 2021-12-07 07:46:32 | gsql:runMe.sql:139: NOTICE: | find_in_set('x','') | | = 0 | 2021-12-07 07:46:32 | gsql:runMe.sql:139: NOTICE: | find_in_set('','a,b,c,,dx') | | = 4 | 2021-12-07 07:46:32 | g...
hypo_set_indexname(entry, indexRelationName.data); // 将新建的虚拟索引entry添加到虚拟索引的全局链表hypoIndexes上,该全局变量为节点类型为hypoIndex*的List链表,记录了全部创建过的虚拟索引 hypo_addIndex(entry); return entry; } // 该函数被赋值给全局的函数指针get_relation_info_hook,当数据库执行EXPLA...
openGauss=# UPDATE ledgernsp.usertable SET name = 'bob2' WHERE id = 2; UPDATE 1 openGauss=# SELECT *, hash FROM ledgernsp.usertable ORDER BY id; id | name | hash ---+---+--- 1 | alex | 1f2e543c580cb8c5 2 | bob2 | 437761affbb7c605...
find_placeholders_in_jointree(root); joinlist = deconstruct_jointree(root); reconsider_outer_join_clauses(root); /* 基于等价类重新考虑外连接*/ /* 对等价类生成额外的限制性子句 */ generate_base_implied_equalities(root); generate_base_implied_qualities(root); ...
opengauss=> set enable_hypo_index = on; SET 1. 2. 开启GUC参数前,执行EXPLAIN+查询语句,如下所示: opengauss=> explain SELECT c_discount from bmsql_customer where c_w_id = 10; QUERY PLAN --- Seq Scan on bmsql_customer (cost=0.00..52963.06 rows=31224 width=4) Filter: (c_w_id = ...
if (find_in_name_map(target_list, cached_columns_from.at(i)->get_col_name())) { CachedColumn *target = new (std::nothrow) CachedColumn(cached_columns_from.at(i)); if (target == NULL) { fprintf(stderr, "failed to new CachedColumn object\n"); ...
通过校验指定用于加密CEK的CMK对象是否存在后加载CMK缓存,然后通过“HooksManager::ColumnSettings::pre_create”语句调用加密函数“EncryptionColumnHookExecutor::pre_create”来校验各参数并生成或加密ENCRYPTED_VALUE值,最后在“EncryptionPreProcess::set_new_query”函数中替换ENCRYPTED_VALUE参数为CEK密文,重构SQL查询语句...
Oid foid;1函数名const char* funcName2参数数量int2 nargs3是否 STRICT ( NULL IN NULL OUT,即若入参有 NULL,则不执行,直接返回一个 NULL)bool strict4是否返回一个集合,就是返回多行的意思。bool retset5底层 C 语言功能代码函数名。PGFunction func6返回值类型 oidOid rettype7所属 schemaOid proname...