* while if it's false, they'll be unlabeled objects. */voidExplainOpenGroup(const char *objtype, const char *labelname, bool labeled, ExplainState *es){ switch (es->format) { case EXPLAIN_FORMAT_TEXT: /* nothing to do */ break; case EXPLAIN_FORMAT_XML: ExplainXMLTag(objtype, X_...
SUCCESS: RETURN 0 FAIL: RETURN -200 while表达式 while 条件表达式 do 逻辑体; end while; LOOP表达式 LOOP... END LOOP;例: OPEN c1; ins_loop: LOOP FETCH c1 INTO v_dept, v_deptname, v_admdept; IF at_end = 1 THEN LEAVEins_loop; --中断循环 ELSEIF v_dept = 'D11' THEN ITERATEins...
Optimization suggestion: Do not use expressions. Join The definition of the Join operator in the execution plan is the same as that in a standard database. The join operation can be classified into hash join, nested loop join, and merge join. Hash Join Hash join is a way of joining ...
EXPLAIN returnsa row of information for each table used in the SELECT statement. It lists thetables in the output in the order that MySQL would read them while processingthe statement. MySQL resolves all joins using a nested-loop join method. Thismeans that MySQL reads a row from the first ...
Do Loops Explain Consciousness? Review of [Am a Strange LoopOur brain is a small lump of organic molecules. It contains some hundred billion neurons, each more complex than a galaxy. They are connected in over a million billion ways. By what incredible hocus-pocus does this tangle of ...
This is because the first time a computer loads this dynamic comic it can take a while. Once it's loaded, it displays "Your Garden", being a barren landscape, with a small pond to the left, some rocks at the far left and right, and a single lamp shining light yellow light on most...
WHILE ( TRUE ) DO_NOTHING; ELSE HALT; If Randall's function says thatMETA_DOESITHALThalts by returning "TRUE" - then that makesMETA_DOESITHALTloop forever. But if it decides that it must not halt by returning "FALSE" - thenMETA_DOESITHALThalts. ...
EXPLAIN returns a row of information for each table used in the SELECT statement. It lists the tables in the output in the order that MySQL would read them while processing the statement. This means that MySQL reads a row from the first table, then finds a matching row in the second tabl...
Explain why the speed of a whirlwind in a tornado is alarmingly high. Explain the basic concept of toppling. Why the mesaure of the sphere doesn't play a part at the pendulum??? Why do we have to bend little forward while rising from a car(without any support)?
EXPLAIN returns a row of information for each table used in the SELECT statement. It lists the tables in the output in the order that MySQL would read them while processing the statement. This means that MySQL reads a row from the first table, then finds a matching row in the second tabl...