drop table t_user; 此时在 clickhouse 处会同步删除对应表,如果查询会报错: show tables;select*from t_user; DB::Exception: Table scene_mms.scene doesn't exist.. mysql 新建表,clickhouse 可以查询到: CREATE TABLE `testck`.`t_user` ( `
es->deparse_cxt = deparse_context_for_plan_rtable(es->rtable, es->rtable_names); es->printed_subplans = NULL; /* * Sometimes we mark a Gather node as "invisible", which means that it's * not displayed in EXPLAIN output. The purpose of this is to allow * running regression tes...
valueIN(SELECTprimary_keyFROMsingle_tableWHEREsome_expr) unique_subquery是一个索引查找函数,可以完全替换子查询,效率更高。 index_subquery 该联接类型类似于unique_subquery。可以替换IN子查询,但只适合下列形式的子查询中的非唯一索引: valueIN(SELECTkey_columnFROMsingle_tableWHEREsome_expr) range 只检索给定范围...
The order of items in the message checked is largely dependent on the protocol for the call as indicated by the preference lists defined in Table 1, Table 2, and Table 3. A dial-peer only needs to satisfy one of the conditions for matching. It is not necessary for all t...
Can someone explain pivot tables like I'm 5? I am not a data person and I can follow step-by-step instructions, but I cannot figure out how to get a certain type of answer when left to my own devices.
I was actually trying to replace zeros with -1 in a table calculation using something like =IFERROR(BITOR(1,C1),-1) where C1 contained the calculation in question. I got around the problem using an IF statement, but I am kind of disappointed that the 1/1/x trick did not work - so...
See Section 15.7.7, “SHOW Statements”. The explain_format system variable, added in MySQL 8.0.32, has no effect on the output of EXPLAIN when used to obtain information about table columns. Obtaining Execution Plan Information The EXPLAIN statement provides information about how MySQL ...
On Nexus 9000 switches running in ACI Mode, there are 3 major hardware counters for ingress interface drop reason on the ASIC. A dropRate in l2IngrPkts, l2IngrPktsAg includes those counters. Three parameters (forwardingRate, errorRate, bufferRate) in the tabl...
[2023.05.04]ScienceQAFeatured in Leaked Google Document: "We Have No Moat, And Neither Does OpenAI": A recent leak of an internal Google document highlights the advancements and impact ofScienceQAwithin the AI research community. 🎯 [2023.05.03]In April, ourScienceQAdataset was downloaded1,42...
PLAN: saves plan information into PLAN_TABLE. If information is stored successfully, "EXPLAIN SUCCESS" is returned. STATEMENT_ID: tags each query. The tag information will be stored in PLAN_TABLE. After the EXPLAIN PLAN statement is executed, plan information is automatically stored in PLAN_TABLE...